1. Department of Gastroenterological Surgery, Tokai University School of Medicine, Kanagawa, Japan
2. Department of Esophageal Surgery, National Cancer Center, Tokyo, Japan
3. Department of Pathology, Tokai University School of Medicine, Kanagawa, Japan
4. Kanagawa Institute of Industrial Science and Technology, Kanagawa, Japan
5. Graduate School of Engineering, Yokohama National University, Kanagawa, Japan
6. Faculty of Engineering, Yokohama National University, Kanagawa, Japan
7. Haptics Research Center, Keio University, Kanagawa, Japan