1. Gastroenterology Department, Colentina Clinical Hospital, Bucharest, Romania
2. Internal Medicine Department, Carol Davila University of Medicine and Pharmacy, Bucharest, Romania
3. Regional Institute of Gastroenterology and Hepatology, Iuliu Hatieganu University of Medicine and Pharmacy, Cluj-Napoca, Romania
4. Digestive Endoscopy Unit, Università Cattolica del Sacro Cuore, Rome, Italy