1. “Carol Davila” University of Medicine and Pharmacy , 37, Dionisie Lupu Street, 020021 Bucharest, Romania
2. “Sf. Ioan” Clinical Emergency Hospital General Surgery Department, , 13, Vitan Barzesti Street, 042122 Bucharest, Romania
3. “Prof. Dr. Alexandru Trestioreanu” Oncological Institute General Surgery Department, , 252, Fundeni Street, 022328 Bucharest, Romania
4. “Coltea” Clinical Hospital General Surgery Department, , 1, I.C.Bratianu Street, 030171 Bucharest, Romania
5. “Bagdasar-Arseni” Clinical Emergency Hospital General Surgery Department, , 12, Berceni Street, 041915 Bucharest, Romania
6. “Th.Burghele” Clinical Hospital Urology Department, , 20, Panduri Street, 050659 Bucharest, Romania
7. “Dr. I. Cantacuzino” Clinical Hospital General Surgery Department, , 5-7, Ioan-Movila Street, 022904 Bucharest, Romania