Gastroenterology and Endoscopy Unit,Department of Gastroenterology,AORN "A.Cardarelli",80131 Naples,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 Medical and Surgical Critical Care,University of Florence,50141 Florence,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;