1 Centro de Investigación Biomédica en Red de Enfermedades Hepáticas y Digestivas (CIBERehd), Barcelona, Spain.
2 Motility and Functional Gut Disorders Unit, University Hospital Germans Trias i Pujol, Barcelona, Spain.
3 Department of Medicine, Autonomous University of Barcelona, Barcelona, Spain.
4 Division of Gastroenterology, University Hospital Zurich, Zurich, Switzerland.
5 Department of Gastroenterology and Hepatology, University Hospital Zurich, Zurich, Switzerland.
6 Digestive System Research Unit, University Hospital Vall d'Hebron, Barcelona, Spain.
7 Division of Gastroenterology B, AOUI Verona, Verona, Italy.
8 UNC Center for Functional GI and Motility Disorders, University of North Carolina at Chapel Hill, Chapel Hill, NC, USA.
9 Department of Gastroenterology, UMR INSERM 1073, Rouen University Hospital, Rouen, France.
10 Department of Physiology, UMR INSERM 1073 & CIC INSERM 1404, Rouen University Hospital, Rouen, France.
11 General Practice, Faculty of Medical Sciences, Newcastle University, Newcastle, UK.
12 Department of Medicine, Israelitic Hospital, Hamburg, Germany.
13 La Mina Primary Health Care Centre, Barcelona, Spain.
14 Catalan Institut of Health (ICS), Barcelona, Spain.
15 Department of Surgery, Division of General Surgery, Medical University of Graz, Graz, Austria.
16 Neurogastroenterology Group, Centre for Neuroscience, Surgery and Trauma, Blizard Institute, Barts and The London School of Medicine & Dentistry, Queen Mary University London, London, UK.
17 Department of Internal Medicine & Clinical Nutrition, Institute of Medicine, Sahlgrenska Academy, University of Gothenburg, Gothenburg, Sweden.
18 Neurogastroenterology Unit, Division of Diabetes, Endocrinology & Gastroenterology, Wythenshawe Hospital, University of Manchester, Manchester, UK.