Flowchart of study methodology. FISPGHAN: Federation of International Societies of Pediatric Gastroenterology Hepatology and Nutrition, APPSGHAN: Asian Pan Pacific Society of Pediatric Gastroenterology Hepatology and Nutrition, CAPGHAN: Commonwealth Association of Paediatric Gastroenterology & Nutrition, ESPGHAN: European Society of Pediatric Gastroenterology Hepatology and Nutrition, LASPGHAN: Latin American Society of Pediatric Gastroenterology Hepatology and Nutrition, NASPGHAN: North American Society of Pediatric Gastroenterology Hepatology and Nutrition. CDC: Center for Disease Control and Prevention – Atlanta United States.