1. Unité d’Endoscopie Interventionnelle, Hôpital Privé des Peupliers, Ramsay Générale de Santé, Paris, France
2. Unit of Gastroenterology and Digestive Endoscopy, F. Miulli General Regional Hospital, Acquaviva delle Fonti, Italy
3. Department of Clinical Medicine and Surgery, Federico II, University of Naples Naples, Italy