1. Surgery Clinic 3, Regional Institute of Gastroenterology and Hepatology “Prof. Dr. Octavian Fodor”, “Iuliu Hațieganul” University of Medicine and Pharmacy, Croitorilor Street 19, 400394 Cluj-Napoca, Romania
2. Clinic I General and Oncological Surgery, “Prof. Dr. Alexandru Trestioreanu” Oncological Institute, “Carol Davila” University of Medicine and Pharmacy, Fundeni Street 252, 022328 Bucharest, Romania
3. General Surgery Clinic, Clinical Hospital “Dr. Carol Davila”, “Carol Davila” University of Medicine and Pharmacy, Calea Griviței 4, 010731 Bucharest, Romania
4. Center for Health Outcomes and Evaluation, Splaiul Unirii Street 45, 030126 Bucharest, Romania