[1] Osaka Med Ctr Canc & Cardiovasc Dideases, Dept Surg Gastroenterol, Osaka, Japan
[2] Univ Tokyo, Dept Chemotherapy, Tokyo, Japan
[3] Teikyo Univ, Dept Surg, Tokyo, Japan
[4] Nanbugo Gen Hosp, Dept Surg, Gosen, Japan
[5] Niigata Canc Ctr Hosp, Dept Surg Gastroenterol, Niigata, Japan
[6] Kinki Univ, Dept Surg, Osakasayama, Japan
[7] Nagoya Univ, Dept Surg Gastroenterol, Nagoya, Aichi, Japan
[8] Kagoshima Univ, Dept Digest Surg, Kagoshima, Japan
[9] Ibaraki Cent Hosp, Div Gastroenterol, Kasama, Ibaraki, Japan
[10] Aichi Canc Ctr Hosp, Dept Clin Oncol, Nagoya, Aichi, Japan
[11] Hyogo Coll Med, Dept Gastroenterol, Nishinomiya, Hyogo, Japan
[12] Jichi Med Univ, Dept Clin Oncol, Shimotsuke, Japan
[13] Tohoku Univ, Grad Sch Med, Div Biostat, Sendai, Miyagi, Japan
[14] Jichi Med Univ, Support Ctr Clin Invest, Shimotsuke, Japan