Gastroenterology and Endoscopy Unit;
Department of Gastroenterology;
AORN "A.Cardarelli";
80131 Naples;
Italy;
Department of Medical and Surgical Critical Care;
University of Florence;
50141 Florence;
Italy;
Gastrointestinal Unit;
Department of Gastroenterology;
University of Pisa;
56100 Pisa;
Italy;
Gastroenterology and Endoscopy Unit;
Cardinal Massaja Hospital;
14100 Asti;
Italy;
Gastroenterology Unit;
M.Bufalini Hospital;
47023 Cesena;
Italy;
Department of Emergency and Organ Transplantation;
University of Bari;
70124 Bari;
Italy;
Department of Oncological and Surgical Sciences;
University of Padua;
35126 Padua;
Italy;
Division of General and Geriatric Surgery;
Second University of Naples;
80131 Naples;
Italy;
Sixth Division of University Surgery;
Department of General Surgery;
San Giovanni Battista Hospital;
10126 Turin;
Italy;
Diagnostic Imaging Centre "N.Aliotta";
Villa Silvia-Senigallia;
I-60100 Ancona;
Italy;