1. Endoscopy Unit, Sanitas CIMA Hospital; Barcelona Spain
2. Department of Gastroenterology; Sanitas CIMA Hospital; Barcelona Spain
3. Teknon Medical Center; Barcelona Spain
4. Faculty of Health Sciences, Universitat Oberta de Cataluny (UOC); Barcelona Spain
5. Planas Clinic; Barcelona Spain
6. Clinical Research Unit; Sanitas CIMA Hospital; Barcelona Spain