1. Department of Next Generation Endoscopic Intervention (Project ENGINE), Graduate School of Medicine, Osaka University, Osaka, Japan;
2. Department of Gastroenterological Surgery, Graduate School of Medicine, Osaka University, Osaka, Japan;
3. 3-D Matrix, Ltd, Tokyo, Japan;
4. FUSO Pharmaceutical Industries, Ltd, Osaka, Japan;
5. Department of Gastroenterological Surgery and Science, Graduate School of Medical Sciences, Kyushu University, Fukuoka, Japan