1. The First Department of Surgery; Nagoya University Hospital; 65 Tsurumai-cho, Showa-ku Nagoya 466-8550 Japan
2. Department of Surgery; Aichi Cancer Center; 1-1 Kanokoden, Chikusa-ku Nagoya 464-8681 Japan
3. The First Department of Surgery; Kagoshima University Hospital; 8-35-1 Sakuragaoka Kagoshima 890-8520 Japan
4. The First Department of Surgery; Teikyo University Hospital; 2-11-1 Kaga, Itabashi-ku Tokyo 173-8606 Japan
5. The First Department of Surgery; Saga Medical School Hospital; 5-1-1 Nabeshima Saga 849-8501 Japan
6. The First Department of Surgery; Mie University Hospital; 2-174 Edobashi Tsu Mie 514-8507 Japan
7. Department of Surgery; Fujita Health University Hospital; 1-98 Dengakugakubo, Kutsukake-cho Toyoake Aichi 470-1192 Japan
8. Ogaki Municipal Hospital; 4-86 Minaminokawa-cho Ogaki Gifu 503-8502 Japan
9. National Sendai Hospital; 2-8-8 Miyagino-ku Sendai 983-8520 Japan
10. Osaka National Hospital; 2-1-14 Hoenzaka, Chuo-ku Osaka 540-0006 Japan
11. Kagoshima Medical Association Hospital; 7-1 Kamoikeshinmachi Kagoshima 890-0064 Japan
12. National Cancer Center Hospital East; 6-5-1 Kashiwanoha Kashiwa Chiba 277-8577 Japan
13. Aichi Cancer Center Hospital; 1-1 Kanokoden Chikusa-ku Nagoya 464-8681 Japan
14. The Second Department of Surgery; Yokohama City University Hospital; 3-9 Fukuura, Kanazawa-ku Yokohama Kanagawa 236-0004 Japan
15. The Second Department of Surgery; Hokkaido University Hospital; Kita 14-jo Nishi 5-chome, Kita-ku Sapporo 060-8648 Japan