1. Gastroenterology and Digestive Endoscopy Unit, ASST Fatebenefratelli Sacco, Milan, Italy;
2. Digestive Endoscopy and Gastroenterology Unit, ASST Cremona, Cremona, Italy;
3. Clinic Epidemiology and Biometric, Scientific Direction, Fondazione IRCCS Policlinico San Matteo, Pavia, Italy;
4. Hospital Pharmacy, ASST Fatebenefratelli Sacco, Milan, Italy;
5. Gastrointestinal Unit, ASST Fatebenefratelli Sacco, Department of Biochemical and Clinical Sciences, University of Milan, Italy