1. Department of Gastroenterology, Digestive Endoscopy Unit, Humanitas Research Hospital, Rozzano, Italy
2. Digestive Endoscopy Unit, Catholic University, Rome, Italy
3. Current affiliation: Division of Gastroenterology, Department of Internal Medicine, Riviera-Chablais, Monthey, Switzerland
4. Humanitas University, Rozzano, Italy
5. Department of Surgical Gastroenterology, Aarhus University Hospital, Aarhus, Denmark