[1] Dokkyo Med Univ, Koshigaya Hosp, Radiol, Koshigaya, Japan
[2] Showa Univ, Sch Med, Radiat Oncol, Shinagawa, Japan
[3] Japan Clin Oncol Grp, Data Ctr, Stat Sect, Natl Canc Ctr, Tokyo, Japan
[4] Natl Canc Ctr, Study Coordinat Sect, Chuo Ku, Tokyo, Japan
[5] Natl Canc Ctr, Radiat Oncol, Chuo Ku, Tokyo, Japan
[6] Kindai Univ, Fac Med, Radiat Oncol, Osakasayama, Japan
[7] Osaka Med Ctr Canc & Cardiovasc Dis, Radiat Oncol, Osaka, Japan
[8] Saitama Canc Ctr, Radiat Oncol, Kita Adachi, Japan
[9] Hiroshima Univ, Grad Sch Biomed Sci, Radiat Oncol, Hiroshima, Japan
[10] Niigata Canc Ctr Hosp, Radiat Oncol, Niigata, Japan
[11] Natl Canc Ctr Hosp East, Radiat Oncol & Particle Therapy, Kashiwa, Chiba, Japan
[12] Shizuoka Canc Ctr, Radiat & Proton Therapy Ctr, Sunto, Japan
[13] Chiba Univ, Grad Sch Med, Diagnost Radiol & Radiat Oncol, Chiba, Japan
[14] Hyogo Canc Ctr, Radiat Oncol, Akashi, Hyogo, Japan
[15] Shikoku Canc Ctr Hosp, Radiotherapy, Matsuyama, Ehime, Japan
[16] Aichi Canc Ctr Hosp, Radiat Oncol, Nagoya, Aichi, Japan
[17] Univ Tokyo Hosp, Radiol, Bunkyo Ku, Tokyo, Japan
[18] Tochigi Canc Ctr, Radiotherapy, Utsunomiya, Tochigi, Japan
[19] Osaka Univ, Grad Sch Med, Radiat Oncol, Suita, Osaka, Japan
[20] Kyoto Univ, Grad Sch Med, Radiat Oncol & Image Appl Therapy, Kyoto, Japan
[21] Komagome Hosp, Tokyo Metropolitan Canc & Infect Dis Ctr, Radiol, Bunkyo Ku, Tokyo, Japan
[22] Tokyo Womens Med Univ, Radiat Oncol, Shinjuku Ku, Tokyo, Japan
[23] Univ Tsukuba, Radiat Oncol, Tsukiba, Japan