1. Department of Gastroenterology and Gastrointestinal Endoscopy, IRCCS San Raffaele Scientific Institute, 20132 Milan, Italy
2. Department of Biomedical Sciences, Humanitas University, Pieve Emanuele, 20089 Milan, Italy
3. Gastroenterologist Hospital Pablo Tobon Uribe, Medellín 050010, Colombia
4. Gastroenterology and Gastrointestinal Endoscopy, Vita-Salute San Raffaele University, 20132 Milan, Italy