1 Pediatric Gastroenterology and Liver Unit, Maternal and Child Health Department, Sapienza University of Rome, Rome, Italy.
2 Division of Allergy and Immunology, Department of Pediatrics, Rady Children's Hospital, University of California San Diego, San Diego, California.
3 Institute of Gastroenterology, Nutrition and Liver Diseases, Schneider Children's Medical Center of Israel, Petach Tikva and Faculty of Medicine, Tel Aviv University, Tel Aviv, Israel.
4 Division of Allergy and Immunology, Department of Pediatrics, Cincinnati Children's Hospital Medical Center, University of Cincinnati College of Medicine, Cincinnati, Ohio.
5 Digestive Health Institute, Children's Hospital Colorado, Gastrointestinal Eosinophilic Diseases Program, Section of Pediatric Gastroenterology, Hepatology, and Nutrition, University of Colorado School of Medicine, Aurora, Colorado.
6 Center for Esophageal Diseases and Swallowing, Division of Gastroenterology and Hepatology, University of North Carolina School of Medicine, Chapel Hill, North Carolina.