[1] Univ Yamanashi, Chuo, Japan
[2] Yokohama City Univ, Sch Med, Yokohama, Kanagawa, Japan
[3] Univ Tokyo, Tokyo, Japan
[4] SAGA HIMAT Fdn, Ion Beam Therapy Ctr, Tosu, Saga, Japan
[5] Tenri Hosp, Nara, Japan
[6] Kyoto Univ, Dept Radiat Oncol & Image Appl Therapy, Grad Sch Med, Kyoto, Japan
[7] Niigata Canc Ctr Hosp, Dept Radiat Oncol, Niigata, Japan
[8] Niigata Canc Ctr Hosp, Niigata, Japan
[9] Univ Tokyo Hosp, Dept Radiol, Tokyo, Japan
[10] Natl Hosp Org Nagoya Med Ctr, Dept Radiat Oncol, Nagoya, Aichi, Japan
[11] Tohoku Univ, Dept Radiat Oncol, Grad Sch Med, Sendai, Miyagi, Japan
[12] Hirosaki Univ, Dept Radiat Oncol, Grad Sch Med, Hirosaki, Aomori, Japan
[13] Osaka Med & Pharmaceut Univ, Dept Radiat Oncol, Osaka, Japan
[14] Hiroshima Univ, Dept Radiat Oncol, Hiroshima, Japan
[15] Varian Med Syst, KK, Tokyo, Japan
[16] Varian Med Syst, Washington, DC USA
[17] Renagence LLC, Morioka, Iwate, Japan