[1] Sakai City Hosp, Dept Surg, Sakai, Osaka, Japan
[2] Toyonaka City Hosp, Dept Surg, Toyonaka, Osaka, Japan
[3] Osaka Med Coll Hosp, Ctr Canc Chemotherapy, Osaka, Japan
[4] Kitano Hosp, Dept Surg, Osaka, Japan
[5] Yao Municipal Hosp, Dept Surg, Yao, Japan
[6] Osaka Natl Hosp, Dept Surg, Osaka, Japan
[7] Osaka Med Ctr Canc & Cardiovasc Dis, Gastrointestinal Oncol, Osaka, Japan
[8] NTT West Osaka Hosp, Dept Surg, Osaka, Japan
[9] Nara Hosp Kinki Univ, Fac Med, Ikoma, Japan
[10] Yamagata Prefectural Cent Hosp, Yamagata, Japan
[11] Osaka Univ, Grad Sch Med, Dept Surg Gastroenterol, Osaka, Japan
[12] Yamanashi Univ, Kofu, Yamanashi 400, Japan
[13] Osaka Univ, Grad Sch Med, Osaka, Japan
[14] Kaizuka City Hosp, Dept Surg, Kaizuka, Japan
[15] Kinki Univ, Dept Surg, Fac Med, Sayama, Osaka, Japan