[1] Izumisano Municipal Hospital,Department of Surgery, Rinku General Medical Center
[2] Osaka University Graduate School of Medicine,Department of Surgery
[3] Osaka General Medical Center,Department of Surgery
[4] Osaka Kosei-Nenkin Hospital,Department of Surgery
[5] Osaka Police Hospital,Department of Surgery
[6] National Hospital Organization Kure Medical Center,Department of Surgery
[7] Osaka Rosai Hospital,Department of Surgery
[8] Nissei Hospital,Department of Surgery
[9] Osaka Central Hospital,Department of Surgery