1. The Institute of National Economy, The Romanian Academy, Calea 13 Septembrie no. 13, sector 5, 050711 Bucharest, Romania
2. Department 10, General Surgery, Faculty of General Surgery, “Carol Davila” University of Medicine and Pharmacy Bucharest, 37 Dionisie Lupu Str., 020021 Bucharest, Romania
3. “Colțea” Clinical Hospital 1 Ion C. Brătianu Blvd., 030167 Bucharest, Romania