1 Division of Gastroenterology, Hepatology, and Nutrition, Department of Life, Health and Environmental Sciences, University of L'Aquila, Piazzale Salvatore Tommasi 1, 67100, L'Aquila, Italy. valvano.marco@libero.it.
2 Division of Gastroenterology, Galliera Hospital, 16128, Genoa, Italy. valvano.marco@libero.it.
3 Division of Gastroenterology, Hepatology, and Nutrition, Department of Life, Health and Environmental Sciences, University of L'Aquila, Piazzale Salvatore Tommasi 1, 67100, L'Aquila, Italy.
4 Hospital Health Management Area, Local Health Authority "Roma 1", 00193, Roma, Italy.
5 Doctoral School in Nursing Sciences and Public Health, University of Rome "Tor Vergata", 00133, Roma, Italy.
6 Department of Biomedicine and Prevention, University of Rome "Tor Vergata", 00133, Roma, Italy.
7 Division of Gastroenterology, Galliera Hospital, 16128, Genoa, Italy.
8 Department of Pediatrics, University of L'Aquila, Piazzale Salvatore Tommasi 1, 67100, L'Aquila, Italy.