1. Territorial Gastroenterology Service, ASL BAT, Andria, Italy
2. Department of Medical and Surgical Sciences, Catholic University, School of Medicine, Rome, Italy
3. Division of Gastroenterology, “Brotzu” Hospital, Cagliari, Italy
4. Division of Internal Medicine and Gastroenterology, Policlinico Universitario “A. Gemelli” IRCCS Foundation, Rome, Italy