1. Gastroenterology Clinic, Henry Dunant Hospital CenterAthens Greece
2. Gastroenterology Unit La Princesa University Hospital Instituto de Investigación Sanitaria Princesa (IIS-IP) Centro de Investigación Biomédica en Red de Enfermedades Hepáticas y Digestivas (CIBEREHD)Madrid Spain
3. Department of Gastroenterology Rabin Medical Center Tel Aviv UniversityTel Aviv Israel
4. Department of Gastroenterology Meath/Adelaide HospitalDublin Ireland