1. Department of General Surgery
2. Department of Thoracic Surgery
3. Department of General Surgery, Tokyo Nishi Tokushukai Hospital, Tokyo, Japan
4. Department of General Surgery, Shonan Atsugi Hospital
5. Department of General Surgery, Shonan Fujisawa Tokushukai Hospital
6. Department of General Surgery, Narita Tomisato Tokushukai Hospital, Chiba
7. Department of General Surgery, Matsubara Tokushukai Hospital, Osaka
8. Department of General Surgery, Sendai Tokushukai Hospital, Miyagi
9. Department of General Surgery, Yamato Tokushukai Hospital, Kanagawa
10. Center for Clinical and Translational Science, Shonan Kamakura General Hospital