[1] Univ Milan, IRCCS Policlin San Donato, Gastroenterol & Gastrointestinal Endoscopy Unit, Milan, Italy
[2] Univ Milan, Human Morphol & Biomed Sci Citta Studi, Milan, Italy
[3] IRCCS Policlin San Donato, UO Biometry & Clin Epidemiol, Milan, Italy
[4] Univ Milan, IRCCS Hosp R Galeazzi, Human Morphol & Biomed Sci Citta Studi, Lab Biotechnol Applicat, Milan, Italy