1. Unit of General Surgery I, Papa Giovanni XXIII Hospital, Bergamo, Italy.
2. Unit of General, Emergency and Transplant Surgery, Sant'Orsola-Malpighi Hospital, University of Bologna, Bologna, Italy.
3. Unit of Gynecologic Surgery, Papa Giovanni XXIII Hospital, Bergamo, Italy.
4. Unit of Gynaecology, Jena University Hospital, Jena, Germany.
5. University of Hawaii at Manoa, Honolulu, HI, USA.
6. Unit of Gynecologic Oncology, Sant'Orsola-Malpighi Hospital, University of Bologna, Bologna, Italy.