1. University of Perugia; Department of General Surgery; Terni Italy 05100
2. University of Torino; Department of Surgical Sciences; Corso Achille Mario Dogliotti 14 Turin Italy 10126
3. Sapienza University of Rome; Department of Surgical Sciences; Viale Regina Elena, 324 Rome Italy 00161
4. Regional Health Authority of Umbria; Health Planning Service; Perugia Italy 06124
5. Medical Military Academy of Sofia; Department of Surgery; "Sv. Georgi Sofiiski" 3 Sofia Bulgaria 1606
6. University of Perugia; Department of Surgical Sciences; Perugia Italy 06034
7. IRCCS Istituto di Ricerche Farmacologiche Mario Negri; Via La Masa, 19 Milan Italy 20156
8. Cincinnati Children’s Hospital Medical Center; Division of Cardiology; 3333 Burnet Ave Cincinnati Ohio USA 45229
9. Mercer University; Georgia Baptist College of Nursing; 3001 Mercer University Dr. Atlanta GA USA 30341
10. Jagiellonian University, Medical College; Department of Endocrine Surgery, Third Chair of General Surgery; 37 Pradnicka Street Krakow Poland 31-202