1 Pancreatobiliary Endoscopy and Endosonography Division, IRCCS San Raffaele Scientific Institute, Milan, Italy; Vita-Salute San Raffaele University, Milan, Italy. Electronic address: capurso.gabriele@hsr.it.
2 Division of Gastroenterology and Gastrointestinal Endoscopy, IRCCS San Raffaele Scientific Institute, Milan, Italy; Vita-Salute San Raffaele University, Milan, Italy.