European guideline on indications, performance, and clinical impact of hydrogen and methane breath tests in adult and pediatric patients. 24 Sep, 2021 | 08:54h | UTC European guideline on indications, performance, and clinical impact of hydrogen and methane breath tests in adult and pediatric patients: European Association for Gastroenterology, Endoscopy and Nutrition, European Society of Neurogastroenterology and Motility, and European Society for Paediatric Gastroenterology Hepatology and Nutrition consensus- UEG Journal