1. Department 5, Carol Davila University of Medicine and Pharmacy, 050474 Bucharest, Romania
2. Department of Gastroenterology, Clinical Emergency Hospital of Bucharest, 014461 Bucharest, Romania
3. Department of Gastroenterology, Fundeni Clinical Institute, 022328 Bucharest, Romania
4. Department of Gastroenterology, Sf. Ioan Clinical Emergency Hospital, 042122 Bucharest, Romania