1. Department of Gastroenterology, Hadassah University Medical Center, Jerusalem, Israel
2. Department of Endoscopy, Kobe University Hospital, Kobe, Japan
3. Division of Gastroenterology, Department of Internal Medicine, Graduate School of Medicine, Kobe University, Kobe, Japan
4. Department of Endoscopy, Kishiwada Tokushukai Hospital, Kishiwada, Japan