Department of Medical and Surgical Sciences;
Surgical Clinic;
Brescia University;
Brescia 25123;
Italy;
Department of Gastroenterological Surgery;
Surgery Ⅱ;
Nagoya University;
Nagoya 452-0813;
Japan;
Department of Human Pathology and Oncology;
Surgical Oncology;
Siena University;
Siena 53011;
Italy;
Department of Surgical Sciences;
Digestive Surgery;
Catholic University;
Rome 00118;
Italy;
Department of General Surgery;
MorgagniPierantoni Hospital;
Forlì 47121;
Italy;
1~(st) Department of General Surgery;
Borgo Trento Hospital;
University of Verona;
Verona 37121;
Italy;