1. Digestive System Research Unit University Hospital Vall d'Hebrón Barcelona Spain
2. Autonomous University of Barcelona Barcelona Spain
3. Centro de Investigación Biomédica en Red de Enfermedades Hepáticas y Digestivas (CIBERehd) Madrid Spain
4. Neurogastroenterology and Motility Unit, Gastroenterology Department, Hospital Clinic of Barcelona University of Barcelona Barcelona Spain
5. Motility and Functional Gut disorders Unit University Hospital Germans Trias I Pujol Badalona Spain
6. Hospital del Mar Barcelona Spain