[1] Kansai Med Univ, Hirakata Hosp, Hirakata, Osaka, Japan
[2] Minoh City Hosp, Osaka, Japan
[3] Osaka Med Coll Hosp, Osaka, Japan
[4] Minoh City Hosp, Mino, Japan
[5] Aizawa Hosp, Matsumoto, Nagano, Japan
[6] Kinki Univ, Sch Med, Dept Med Oncol, Osaka 589, Japan
[7] Osaka Univ, Osaka, Japan
[8] Dongo Hosp, Yamatotakada, Japan
[9] Sakai Municipal Hosp, Dept Surg, Sakai, Osaka, Japan