1. Unit of General Surgery, APSS of Trento, Alto Garda e Ledro Hospital, Arco (TN), Italy.
2. Department of Epidemiology, APSS of Trento, Trento, Italy.
3. Hospital Health Direction, APSS of Trento, Alto Garda e Ledro Hospital, Arco (TN), Italy.
4. Laboratory of Clinical Pathology, APSS of Trento, Alto Garda e Ledro Hospital, Arco (TN), Italy.