[1] Natl Canc Ctr, Tokyo 1040045, Japan
[2] Natl Canc Ctr, JCOG Data Ctr, Tokyo 104, Japan
[3] Natl Canc Ctr Hosp East, Chiba, Japan
[4] Osaka Med Ctr Canc & Cardiovasc Dis, Osaka, Japan
[5] Minoh City Hosp, Osaka, Japan
[6] Niigata Canc Ctr Hosp, Niigata, Japan
[7] Yamagata Prefectural Cent Hosp, Yamagata, Japan
[8] Kansai Rosai Hosp, Amagasaki, Hyogo, Japan
[9] Shizuoka Canc Ctr, Shizuoka, Japan
[10] Kanagawa Canc Ctr, Yokosuka, Kanagawa, Japan
[11] Natl Hosp Org Osaka Natl Hosp, Osaka, Japan
[12] Natl Hosp Org Shikoku Canc Ctr, Shikoku, Ehime, Japan