CLINICAL GASTROENTEROLOGY
Series Editor George Y. Wu
University of Connecticut Health Center, Farmington, CT, USA
For further volumes:
Christophe Faure • Carlo Di Lorenzo
Nikhil Thapar
Editors
Pediatric
Neurogastroenterology
Gastrointestinal Motility and
Functional Disorders in Children
Editors
Christophe Faure
Division of Pediatric Gastroenterology Sainte-Justine University Health Center Department of Pediatrics
Université de Montréal Montréal, QC, Canada Nikhil Thapar Gastroenterology Unit University College London Institute of Child Health Department of Paediatric
Gastroenterology,
Neurogastroenterology, and Motility Great Ormond Street Hospital
for Children London, UK
Carlo Di Lorenzo
Division of Pediatric Gastroenterology Nationwide Children’s Hospital The Ohio State University Columbus, OH, USA
ISBN 978-1-60761-708-2 ISBN 978-1-60761-709-9 (eBook) DOI 10.1007/978-1-60761-709-9
Springer New York Heidelberg Dordrecht London
Library of Congress Control Number: 2012952724 © Springer Science+Business Media New York 2013
This work is subject to copyright. All rights are reserved by the Publisher, whether the whole or part of the material is concerned, speci fi cally the rights of translation, reprinting, reuse of illustrations, recitation, broadcasting, reproduction on micro fi lms or in any other physical way, and transmission or information storage and retrieval, electronic adaptation, computer software, or by similar or dissimilar methodology now known or hereafter developed. Exempted from this legal reservation are brief excerpts in connection with reviews or scholarly analysis or material supplied speci fi cally for the purpose of being entered and executed on a computer system, for exclusive use by the purchaser of the work. Duplication of this publication or parts thereof is permitted only under the provisions of the Copyright Law of the Publisher’s location, in its current version, and permission for use must always be obtained from Springer. Permissions for use may be obtained through RightsLink at the Copyright Clearance Center. Violations are liable to prosecution under the respective Copyright Law.
The use of general descriptive names, registered names, trademarks, service marks, etc. in this publication does not imply, even in the absence of a speci fi c statement, that such names are exempt from the relevant protective laws and regulations and therefore free for general use. While the advice and information in this book are believed to be true and accurate at the date of publication, neither the authors nor the editors nor the publisher can accept any legal responsibility for any errors or omissions that may be made. The publisher makes no warranty, express or implied, with respect to the material contained herein.
Printed on acid-free paper Humana Press is a brand of Springer
To my parents with love.
Christophe Faure
To my parents for their unconditioned
support and love.
Carlo Di Lorenzo
To my beloved father Baldev Sahai
Thapar—blessed by your and mum’s
unending love, forever my guiding light
and inspiration.
Nikhil Thapar
To our patients and all the children
af fl icted by motility and sensory digestive
disorders.
Christophe Faure
Carlo Di Lorenzo
vii
Foreword
Welcome to the fi rst comprehensive textbook of pediatric neurogastroenterol-ogy and motility. Thirty years have passed since the fi rst stirrings of interest in this fi eld. A number of factors coalesced to facilitate its evolution from oddity and anecdote to mainstream basic science, epidemiology, and clinical trials. First, there has been an increase in the number of pediatric gastroenter-ologists, providing a reservoir of intellectual curiosity. Second, medical tech-nology has advanced, so that we measure more, both in the basic science laboratory and in pediatric practice. Third, medical care has improved, so that infants who were dying before diagnosis now live, for example, on parenteral nutrition, so that their pseudo-obstruction can be characterized. Fourth, the 1999 publication of pediatric Rome criteria, symptom-based criteria for the diagnosis of functional gastrointestinal disorders, inspired new investigations into mind–body pediatric medicine. Motility themed advances dominated the fi rst 10 years. During the second 10 years the emphasis shifted to understand-ing visceral pain and other afferent sensory sensations and re fl exes. In the past 10 years the focus has been on brain–gut interactions and the functional gastrointestinal disorders. This text admirably covers all three areas of empha-sis. The publication of this volume marks the end of the beginning for pediat-ric neurogastroenterology and motility.
ix
Preface
In the past 20 years, major advances have been achieved in the care of chil-dren with pediatric gastrointestinal motility and sensitivity disorders. This is a re fl ection of the progress that has been made understanding such conditions at the developmental and molecular level as well as the development of novel tools to investigate and treat them. These progresses have led to the birth of a new “Science”, namely Neurogastroenterology , which is devoted to “study the interface of all aspects of the digestive system with the different branches of the nervous system” and which has now established itself as a major area of clinical practice and research. In the past two decades, there has been an almost exponential increase in publications of scienti fi c papers in the fi eld, a plethora of international fora for the discussion of such conditions and cre-ation of dedicated journals with respectable citcre-ation indices. Pediatric neuro-gastroenterology and motility has not lagged behind and arguably is fast becoming a major and popular subspecialty in its own right.
With this book we aimed to draw upon an extensive international expertise to provide a contemporary state-of-the-art reference textbook for pediatric neurogastroenterology and motility that both specialists and generalists alike will fi nd helpful.
Overview of the Book
The fi rst chapters are dedicated to some of the success stories of the fi eld. Utilizing a range of animal models and studies in the human itself we now have a remarkable understanding of the mechanisms involved in the forma-tion of a funcforma-tional enteric neuromusculature. It is clear that development is a complex spatiotemporal process involving the coordinated interplay of a number of genes regulating cellular properties and organogenesis. This com-plexity is re fl ected in one of the most commonly recognized gut motility disorders, Hirschsprung’s disease, a condition caused by a failure of devel-opment of the enteric nervous system. The ontogeny of motility patterns within the GI tract is now understood in great detail. Utilizing new technolo-gies, animal models, and some studies in humans, researchers have been able to show that GI motility is regulated by a number of mechanisms that vary in relation to stage of development, maturity, and region within the GI tract. It is very likely that the coming years will see an increasing recognition
x Preface
of the developmental and related functional pathogenic mechanisms under-lying a range of disorders involving enteric nerves, muscles and interstitial cells of Cajal. The rich sensory innervation that not only underlies the nor-mal functioning of the GI tract but has increasingly been implicated in a range of functional GI disorders is thoroughly described. This sensory inner-vation and its processing appear to be plastic and in fl uenced by a number of disease mechanisms and clinical states including infection, in fl ammation, and psychological stress. How visceral sensation is modulated by the inter-play among the CNS, neurogastrointestinal system, in fl ammation, and gut microbial ecosystem especially in relation to irritable bowel syndrome is addressed in a subsequent chapter. This theme is further developed with the discussion of the bio-psycho-social in fl uences on enteric neuromuscular function and how the social and cultural settings of patients act to modify physiologic responses.
The belly of the book summarizes the practical investigations that are available in the pediatric neurogastroenterologist’s armamentarium. In many respects this is where much of the recent strides of the fi eld have taken place, moving it into the realms of a high-tech futuristic specialty. Major highlights have been the advent of impedance and high-resolution manometry technolo-gies, which did not exist when the fi rst textbook on pediatric gastrointestinal motility was published, and are now well accepted and standardized diagnos-tic techniques. The role of sensitivity tests, namely barostat and satiety drink-ing tests, in recognizdrink-ing altered gut sensation as a key pathophysiologic component of functional gastrointestinal disorders, is discussed. The applica-tion to clinical investigaapplica-tion of radionucleotide scintigraphy tests which have seen in recent years a wider application given their improved tolerability, cost, and safety pro fi le is described in detail. Older and newer technologies ranging from electrogastrography and transit studies to 3D-ultrasonography and the wireless motility capsule are presented. Finally, there is a discussion of autonomic function testing as indirect measure of gastrointestinal function. The subsequent chapters deal with the practical approach to and description of the pathology of disorders of enteric neuromusculature and the genetic underpinning of motility disorders.
The next section of the book focuses on a journey through the GI tract detailing motility disorders that occur in each region. Feeding and swallow-ing disorders in a range of GI and systemic diseases are discussed. Pediatric esophageal and gastric motor disorders are summarized, and intestinal pseudo-obstruction syndrome and Hirschsprung’s diseases, the most severe forms of GI dysmotility, are discussed in great detail. The book then focuses on secondary (malformative) and postsurgical motor disorders.
The book then transitions from more classic motility disorders to func-tional GI disorders, arguably one of the most common and challenging group of conditions encountered by primary care providers and subspecialists. The role of the Rome criteria in developing the fi eld of pediatric functional disorders is highlighted. Infant regurgitation and gastroesophageal re fl ux disease, infantile colic, functional dyspepsia, irritable bowel syndrome, cyclic vomiting syndrome, aerophagia, adolescent rumination syndrome, and func-tional constipation are discussed.
xi Preface
The fi nal section of the book is dedicated to therapy, including pharmaco-therapy, cognitive behavioral pharmaco-therapy, gastric electrical stimulation, intestinal transplantation, and the potential use of stem cells.
Montreal , QC , Canada Christophe Faure
Columbus , OH , USA Carlo Di Lorenzo
xiii
Acknowledgments
To our wives (Sophie, Daniela, and Catherine) and children (Alexandre, Timothé, Clémentine, Gaspar, Mario, Cristina, Francesca, Valentina, Sachin, Nayan, and Kira) for all their love, support, and patience throughout the prep-aration of this book.
Montreal, QC, Canada Christophe Faure
Columbus, OH, USA Carlo Di Lorenzo
xv
Contents
Part I Physiology and Development of the Enteric Neuromuscular System and Gastrointestinal Motility
1 Introduction to Gut Motility and Sensitivity ... 3 Nikhil Thapar, Christophe Faure, and Carlo Di Lorenzo
2 Development of the Enteric Neuromuscular System ... 9 Tiffany A. Heanue and Alan J. Burns
3 Development of Gut Motility ... 23 Heather M. Young, Elizabeth A. Beckett, Joel C. Bornstein,
and Sudarshan R. Jadcherla
4 Visceral Sensitivity ... 37 Christophe Faure
5 Inflammation, Microflora, Motility,
and Visceral Sensitivity... 49
Sonia Michail and Mun-Wah Ng
6 Integration of Biomedical and Psychosocial Issues in Pediatric Functional Gastrointestinal
and Motility Disorders ... 59 Miranda A.L. van Tilburg
7 Functional Gastrointestinal Disorders:
An Anthropological Perspective ... 71 Sylvie Fortin, Liliana Gomez, and Annie Gauthier
Part II Motility and Sensory Testing
8 Esophageal Manometry ... 79 Roberta Buonavolontà, Marina Russo, Rossella Turco,
and Annamaria Staiano
9 Antroduodenal Manometry ... 91 Osvaldo Borrelli, Valentina Giorgio, and Nikhil Thapar
10 Colonic Manometry ... 107 Brian P. Regan, Alejandro Flores, and Carlo Di Lorenzo
xvi Contents
11 Anorectal Manometry... 119
Minou Le-Carlson and William Berquist
12 Esophageal pH and Impedance Monitoring ... 129 Rachel Rosen and Eric Chiou
13 Barostat and Other Sensitivity Tests ... 143 Christophe Faure
14 Radionuclide Transit Tests ... 149 Lorenzo Biassoni, Keith J. Lindley, and Osvaldo Borrelli
15 Electrogastrography, Breath Tests, Ultrasonography,
Transit Tests, and SmartPill ... 163 Leonel Rodriguez
16 Autonomic Nervous System Testing ... 177 Gisela Chelimsky and Thomas C. Chelimsky
Part III Disorders of Digestive Motility: Developmental and Acquired Anomalies of the Enteric Neuromuscular System
17 Pathology of Enteric Neuromusculature ... 187 Virpi Vanamo Smith
18 Genetics of Motility Disorder: Gastroesophageal Reflux, Triple A Syndrome, Hirschsprung Disease,
and Chronic Intestinal Pseudo-Obstruction ... 203 Jonathan M. Gisser and Cheryl E. Gariepy
19 Feeding and Swallowing Disorders ... 217 Nathalie Rommel and Taher Omari
20 Esophageal Motor Disorders: Achalasia, Diffuse Esophageal Spasm, Nonspecific
Motor Disorders, Eosinophilic Esophagitis ... 227 Hayat Mousa and Ann Aspirot
21 Gastric Motor Disorders: Gastroparesis
and Dumping Syndrome ... 247 Miguel Saps and Ashish Chogle
22 Chronic Intestinal Pseudo-Obstruction ... 257 Paul E. Hyman and Nikhil Thapar
23 Hirschsprung Disease ... 271 Robert O. Heuckeroth
xvii Contents
24 Motility Problems in Developmental Disorders: Cerebral Palsy, Down Syndrome, William Syndrome,
Familial Dysautonomia, and Mitochondrial Disorders ... 285 Annamaria Staiano and Massimo Martinelli
Part IV Motility Disorders after Surgery and Developmental Anomalies of the Enteric Neuromuscular System Secondary to Anatomical Malformations
25 Esophageal Atresia ... 295 Julie Castilloux and Christophe Faure
26 Anorectal Malformations ... 301 Jose M. Garza and Ajay Kaul
27 Small Bowel and Colonic Dysfunction After Surgery ... 307 Roberto Gomez, H. Nicole Lopez, and John E. Fortunato
28 Gastric Function After Fundoplication ... 317 Samuel Nurko
Part V Functional Gastrointestinal Disorders
29 History and Definition of the Rome Criteria ... 325 Andrée Rasquin
30 Infant Regurgitation and Pediatric Gastroesophageal
Reflux Disease ... 331 Yvan Vandenplas, Bruno Hauser, Thierry Devreker,
and Silvia Salvatore
31 Infant Colic ... 347 David R. Fleisher
32 Functional Diarrhea in Toddlers (Chronic Nonspecific
Diarrhea) ... 355 Ernesto Guiraldes and José Luis Roessler
33 Functional Dyspepsia ... 359 Alycia Leiby and Denesh K. Chitkara
34 Irritable Bowel Syndrome ... 367 Bella Zeisler and Jeffrey S. Hyams
35 Functional Abdominal Pain ... 377 Manu R. Sood
36 Cyclic Vomiting Syndrome: Comorbidities
and Treatment ... 391 Bhanu Sunku and B.U.K. Li
37 Aerophagia ... 401 Oren Koslowe and Denesh K. Chitkara
xviii Contents
38 Adolescent Rumination Syndrome ... 405 Anthony Alioto and Carlo Di Lorenzo
39 Constipation... 413
Vera Loening-Baucke and Alexander Swidsinski
40 Functional Fecal Incontinence ... 429 Rosa Burgers and Marc A. Benninga
Part VI Treatments
41 Drugs Acting on the Gut: Prokinetics, Antispasmodics,
Laxatives ... 441 Aileen F. Har and Joseph M.B. Croffie
42 Gastric Electrical Stimulation ... 465 Carlo Di Lorenzo, Hayat Mousa, and Steven Teich
43 Cognitive Behavioral Therapy for Children
with Functional Abdominal Pain ... 471 Nader N. Youssef and Miranda A.L. van Tilburg
44 Complementary and Alternative Treatments
for Motility and Sensory Disorders ... 481 Arine M. Vlieger and Marc A. Benninga
45 Cellular-Based Therapies for Pediatric GI
Motility Disorders ... 493 Ryo Hotta, Dipa Natarajan, Alan J. Burns, and Nikhil Thapar
46 Chronic Intestinal Pseudo-obstruction Syndrome:
Surgical Approach and Intestinal Transplantation ... 507 Olivier Goulet and Sabine Irtan
xix
Contributors
Anthony Alioto , PhD Department of Psychology , Nationwide Children’s Hospital , Columbus , OH , USA
Ann Aspirot , MD Department of Surgery, Pediatric Surgery Division , Sainte-Justine University Health Center, University of Montreal , Montreal , QC , Canada
Elizabeth A. Beckett , PhD Discipline of Physiology , School of Medical Sciences, University of Adelaide , Adelaide , SA , Australia
Marc A. Benninga , MD, PhD Department of Pediatric Gastroenterology , Emma Children’s Hospital/Academic Medical Centre , Amsterdam , The Netherlands
William Berquist , MD Pediatrics Department, Gastroenterology Division , Lucile Packard Children’s Hospital, Stanford University , Stanford , CA , USA
Lorenzo Biassoni , MSc, FRCP Nuclear Medicine, Department of Radiology , Great Ormond Street Hospital for Children , London , UK
Joel C. Bornstein , PhD Department of Physiology , University of Melbourne , Melbourne , VIC , Australia
Osvaldo Borrelli , MD, PhD Division of Neurogastroenterology & Motility, Department of Paediatric Gastroenterology , Great Ormond Street Hospital for Children , London , UK
Roberta Buonavolontà , MD Department of Pediatrics , University of Naples , Naples , Italy
Rosa Burgers , MD Department of Pediatric Gastroenterology , Emma Children’s Hospital/Academic Medical Centre , Amsterdam , The Netherlands
Alan J. Burns , PhD Neural Development Unit , UCL Institute of Child Health , London , UK
Julie Castilloux , MD Pediatric Department, Gastroenterology Division , Centre Hospitalier Universitaire Laval , Quebec City , QC , Canada
xx Contributors
Gisela Chelimsky , MD Pediatric Gastroenterology Division, Pediatrics Department , Medical College of Wisconsin , Milwaukee , WI , USA
Thomas C. Chelimsky , MD Neurology Department , Medical College of Wisconsin , Milwaukee , WI , USA
Eric Chiou , MD Center for Motility and Functional Gastrointestinal Disorders, Children’s Hospital Boston , Boston , MA , USA
Denesh K. Chitkara , MD Pediatric Gastroenterology and Nutrition , Goryeb Children’s Hospital, Atlantic Health , Morristown , NJ , USA
Ashish Chogle , MD, MPH Pediatric Gastroenterology, Hepatology and Nutrition Division, Pediatrics Department , Children’s Memorial Hospital, Northwestern University , Chicago , IL , USA
Joseph M.B. Crof fi e , MD, MPH Division of Gastroenterology, Pediatrics Department , James Whitcomb Riley Hospital for Children , Indianapolis , IN , USA
Thierry Devreker , MD Pediatric Gastroenterology Department , Universitair Kinderziekenhuis Brussel , Brussels , Belgium
Carlo Di Lorenzo , MD Division of Pediatric Gastroenterology , Nationwide Children’s Hospital, The Ohio State University , Columbus , OH , USA
Christophe Faure , MD Division of Pediatric Gastroenterology , Department of Pediatrics, Sainte-Justine University Health Center, Université de Montréal , Montréal , QC , Canada
David R. Fleisher , MD Pediatric Gastroenterolgy Division, Department of Child Health , University of Missouri School of Medicine , Columbia , MO , USA
Alejandro Flores , MD Pediatric Gastroenterology , Tufts Medical Center , Boston , MA , USA
Sylvie Fortin , PhD Anthropology Department , Université de Montréal , Montréal , QC , Canada
John E. Fortunato , MD Department of Pediatrics, Gastroenterology Division , Wake Forest University , Winston-Salem , NC , USA
Cheryl E. Gariepy , MD Center for Molecular and Human Genetics , The Research Institute at Nationwide Children’s Hospital , Columbus , OH , USA Pediatric Gastroenterology, Hepatology and Nutrition Division, Pediatrics Department , The Ohio State University College of Medicine , Columbus , OH , USA
Jose M. Garza , MD, MS Gastroenterology, Heptaology and Nutrition Division, Pediatrics Department , Cincinnati Children’s Hospital Medical Center , Cincinnati , OH , USA
Annie Gauthier , PhD Research Center, Sainte-Justine University Health Center , Montreal , QC , Canada
xxi Contributors
Valentina Giorgio Division of Neurogastroenterology & Motility , Department of Paediatric Gastroenterology, Great Ormond Street Hospital for Children , London , UK
Jonathan M. Gisser , MD MSc Center for Molecular and Human Genetics , The Research Institute at Nationwide Children’s Hospital , Columbus , OH , USA
Division of Pediatric Gastroenterology, Hepatology and Nutrition, Pediatrics Department , The Ohio State University College of Medicine , Columbus , OH , USA
Liliana Gomez , MSc Research Center , Sainte-Justine University Hospital , Montreal , QC , Canada
Roberto Gomez , MD Pediatric Gastroenterology Department , Wake Forest University , Winston-Salem , NC , USA
Olivier Goulet , MD, PhD Pediatrics Department , Hôpital Necker-Enfants Malades at the University of Paris 5 René Descartes , Paris , France
Pediatric Gastroenterology-Hepatology and Nutrition and Reference Center for Rare Digestive Diseases , Intestinal Failure Rehabilitation Center , Paris , France
Ernesto Guiraldes , MD Ponti fi cia Universidad Católica de Chile and Universidad Mayor , Santiago , Chile
Aileen F. Har , MB, BCh Division of Gastroenterology, Pediatrics Department , James Whitcomb Riley Hospital for Children , Indianapolis , IN , USA
Bruno Hauser , MD Paediatric Gastroenterology Hepatology and Nutrition Division, Paediatrics Department , Universitair Kinderziekenhuis Brussel , Brussels , Belgium
Tiffany A. Heanue , PhD Division of Molecular Neurobiology , National Institute for Medical Research , Mill Hill , London , UK
Robert O. Heuckeroth , MD, PhD Pediatric Gastroenterology Division, Pediatrics Department , Washington University School of Medicine in St. Louis , St. Louis , MO , USA
Developmental Biology , St. Louis Children’s Hospital , St. Louis , MO , USA
Ryo Hotta , MD, PhD Department of Anatomy and Neuroscience , The University of Melbourne , Melbourne , Australia Department of Pediatric Surgery , Keio University School of Medicine , Tokyo , Japan
Jeffrey S. Hyams , MD Digestive Diseases , Connecticut Childrens Medical Center, University of Connecticut School of Medicine , Hartford , CT , USA
Paul E. Hyman , MD Gastroenterology Division , Children’s Hospital, Louisiana State University , New Orleans , LA , USA
Sabine Irtan , MD Pediatric Surgery , Hôpital Necker-Enfants Malades, University of Paris , Paris , France
xxii Contributors
Sudarshan R. Jadcherla , MD, FRCPI, DCH, AGAF Department of Pediatrics, Division of Neonatology, Pediatric Gastroenterology and Nutrition, The Ohio State University College of Medicine and Public Health
Section of Neonatology , Nationwide Children’s Hospital , Columbus , OH , USA
Ajay Kaul , MD Division of Gastroenterology, Pediatrics Department , Cincinnati Children’s Hospital Medical Center , Cincinnati , OH , USA
Oren Koslowe , MD Gastroenterology and Nutrition, Pediatrics Department , Goryeb Children’s Hospital/Atlantic Health System , Morristown , NJ , USA
Minou Le-Carlson , MD Pediatric Gastroenterology, Hepatology and Nutrition, Pediatrics Department , Stanford University Medical Center, Lucile Packard Children’s Hospital , Palo Alto , CA , USA
Alycia Leiby , MD Pediatric Gastroenterology and Nutrition , Goryeb Children’s Hospital, Atlantic Health , Morristown , NJ , USA
B . U.K. Li , MD Division of Gastroenterology, Hepatology and Nutrition, Pediatrics Department , Medical College of Wisconsin , Milwaukee , WI , USA
Keith J. Lindley , MD, PhD Division of Neurogastroenterology & Motility, Department of Paediatric Gastroenterology , Great Ormond Street Hospital for Children , London , UK
Vera Loening-Baucke , MD General Pediatric Division, Pediatrics Department , University of Iowa , Iowa City , IA , USA
Medizinische Klinik und Poliklinik, Gastroenterologie, Hepatologie and Endokrinologie , Charité Universitätsmedizin , Berlin , Germany
H. Nicole Lopez , MD Pediatrics Department , Wake Forest University School of Medicine , Winston-Salem , NC , USA
Massimo Martinelli , MD Pediatric Gastroenterology Division, Pediatrics Department , University of Naples “Federico II” , Naples , Italy
Sonia Michail , MD The Children’s Medical Center, Gastroenterology, One Children’s Plaza, Dayton, OH , USA
Hayat Mousa , MD Pediatric Gastroenterology Hepatology and Nutrition, Department of Pediatrics , Nationwide Children Hospital, Ohio State University , Columbus , OH , USA
Dipa Natarajan , MSc, MPhil, PhD Neural Development Unit , UCL, Institute of Child Health , London , UK
Mun-Wah Ng , MD Pediatrics Department, Pediatrics Department, Gastroenterology & Nutrition Division, Children’s , Hospital Los Angeles , Los Angeles , CA , USA
Samuel Nurko , MD, MPH Center for Motility and Functional Gastrointestinal Disorders , Children’s Hospital , Boston , MA , USA
xxiii Contributors
Taher Omari , PhD Gastroenterology Unit , Child, Youth and Women’s Health Service, School of Paediatrics and Reproductive Health University of Adelaide , Adelaide , SA , Australia
Andrée Rasquin , MD Gastroenterology Division, Pediatrics Department , Hospital Ste Justine, University of Montreal , Montreal , QC , Canada
Brian P. Regan DO Pediatric Gastroenterology , Tufts Medical Center , Boston , MA , USA
Leonel Rodriguez , MD, MS Department of Medicine, Gastroenterology Division , Children’s Hospital Boston, Harvard Medical School , Boston , MA , USA
José Luis Roessler , MD Pediatric Gastroenterology Division, Pediatrics Department , Hospital Félix Bulnes , Santiago de , Chile
Nathalie Rommel , MSc, PhD Department Neurosciences, Faculty of Medicine, Experimental Otorhinolaryngology , University of Leuven , Leuven , Belgium
Rachel Rosen , MD, MPH Harvard Medical School, Center for Motility and Functional Gastrointestinal Disorders Children’s Hospital Boston, Boston , MA , USA
Marina Russo , MD Department of Pediatrics , University of Naples Federico II , Naples , Italy
Silvia Salvatore , MD Pediatric Department , University of Insubria, Ospedale “F. Del Ponte” , Varese , Italy
Miguel Saps , MD Pediatric Gastroenterology, Hepatology and Nutrition Division, Pediatrics Department , Children’s Memorial Hospital, Northwestern University , Chicago , IL , USA
Virpi Vanamo Smith , PhD, MRCPath Paediatric Surgery Unit , Institute of Child Head, University College London , London , UK
Manu R. Sood , MD(UK), FRCPCH Pediatric Gastroenterology Division, Medical College of Wisconsin, Children’s Hopsital of Wisconsin, Milwaukee, WI, USA
Annamaria Staiano , MD Pediatric Gastoenterology Division, Pediatrics Department , University of Naples “Federico II” , Naples , Italy
Bhanu Sunku , MD Mount Kisco Medical Group , Mount Kisco , NY , USA
Alexander Swidsinski , MD, PhD Gastroenterologie, Hepatologie and Endokrinologie , Medizinische Klinik und Poliklinik, Charité Universitätsmedizin , Berlin , Germany
Steven Teich , MD Pediatric Surgery , Nationwide Children’s Hospital , Columbus , OH , USA Clinical Surgery, Pediatric Surgery , The Ohio State University , Columbus , OH , USA
xxiv Contributors
Nikhil Thapar , BSc(Hon), BM(Hon), MRCP, MRCPCH, PhD
Gastroenterology Unit , University College London, Institute of Child Health, Division of Neurogastroenterology and Motility , London , UK
Department of Paediatric Gastroenterology, Great Ormond Street Hospital for Children , London , UK
Rossella Turco , MD Department of Pediatrics , University of Naples Federico II , Naples , Italy
Miranda A.L. van Tilburg , PhD UNC Center for Functional GI and Motility Disorders, Chapel Hill, NC, USA
Department of Medicine, Division of Gastroenterology and Hepatology, University of North Carolina at Chapel Hill, Chapel Hill, NC, USA
Yvan Vandenplas , MD, PhD Pediatrics , Universitair Ziekenhuis Brussel, Vrye Universiteit Brussel , Brussels , Belgium
Arine M. Vlieger , MD, PhD Department of Pediatrics , St. Antonius Hospital , Nieuwegein , The Netherlands
Heather M. Young , PhD Department of Anatomy & Neuroscience, University of Melbourne, Parkville, VIC , Australia
Nader N. Youssef , MD, FAAP, FACG Adolescent Gastroenterology , Digestive Health Care Center , Hillsborough , NJ , USA
Bella Zeisler , MD Division of Digestive Diseases, Hepatology, and Nutrition , Connecticut Children’s Medical Center , Hartford , CT , USA