[1] Osaka Medical and Pharmaceutical University,Department of General and Gastroenterological Surgery
[2] Wakayama Medical University,Second Department of Surgery
[3] Kinki University,Department of Surgery, Faculty of Medicine
[4] Hirakata Hospital,Department of Surgery
[5] Kansai Medical University,Department of Surgery
[6] Nara Medical University,Department of Surgery
[7] Shiga University of Medical Science,Department of Hepato
[8] Osaka City University Graduate School of Medicine,Biliary