1. Gastroenterology Department, “Sfanta Maria” Hospital, 011172 Bucharest, Romania
2. Department of Internal Medicine and Rheumatology, Dr. I. Cantacuzino Clinical Hospital, “Carol Davila” University of Medicine and Pharmacy, 020021 Bucharest, Romania
3. Center for Digestive Disease and Liver Transplantation, Fundeni Clinical Institute, Carol Davila University of Medicine and Pharmacy, 020021 Bucharest, Romania
4. Surgery Department, Dr. Ion Cantacuzino Clinical Hospital, 011437 Bucharest, Romania