Hyogo Medical University, Wakayama Medical University, Wakayama Medical University, Kansai Medical University, Nara Medical University School of Medicine - Department of Surgery, Nagoya University, Kindai University, University of Toyama, Shimane University, Hiroshima University Graduate School of Biomedical and Health Sciences - Department of Surgery, Osaka Metropolitan University, Kagoshima University, Tokyo Medical University, Kumamoto University, Kyoto Prefectural University, Kyushu University, Wakayama Medical University, Wakayama Medical University, Wakayama Medical University and Showa University