[1] Kanagawa Canc Ctr, Yokohama, Kanagawa, Japan
[2] Natl Canc Ctr Hosp E, Chiba, Japan
[3] Natl Kinki Cent Hosp Chest Dis, Osaka, Japan
[4] Osaka City Gen Hosp, Osaka, Japan
[5] Niigata Canc Ctr Hosp, Niigata, Japan
[6] Aichi Canc Ctr, Nagoya, Aichi 464, Japan
[7] Kinki Univ, Sch Med, Osaka 589, Japan
[8] Tochigi Canc Ctr, Utsunomiya, Tochigi, Japan
[9] Yokohama Municipal Citizens Hosp, Yokohama, Kanagawa, Japan
[10] Natl Canc Ctr, Cent Hosp, Tokyo 104, Japan
[11] Natl Canc Ctr, Res Inst, Canc Informat & Epidemiol Div, Tokyo 104, Japan