[1] Hiroshima High Precis Radiotherapy Canc Ctr, Hiroshima, Japan
[2] Hiroshima Univ, Inst Biomed & Hlth Sci, Dept Radiat Oncol, Hiroshima, Japan
[3] Niigata Canc Ctr Hosp, Dept Radiat Oncol, Niigata, Japan
[4] Yokohama City Univ, Dept Gastroenterol, Med Ctr, Yokohama, Japan
[5] Nagasaki Univ, Dept Gastroenterol & Hepatol, Grad Sch Biomed Sci, Nagasaki, Japan
[6] Yamanashi Univ Hosp, Dept Radiat Oncol, Yamanashi, Japan
[7] Natl Canc Ctr Hosp Japan, Dept Radiat Oncol, Tokyo, Japan
[8] Kobe City Med Ctr Gen Hosp, Dept Radiat Oncol, Kobe, Hyogo, Japan
[9] Hokkaido Univ, Dept Radiat Oncol, Fac Med, Sapporo, Japan
[10] Kyusyu Univ Hosp, Dept Radiat Oncol, Fukuoka, Japan
[11] Komagome Hosp, Tokyo Metropolitan Canc & Infect Dis Ctr, Dept Radiat Oncol, Tokyo, Japan
[12] Tsukuba Univ Hosp, Dept Radiat Oncol, Ibaraki, Japan
[13] Kyoto Univ Hosp, Dept Radiat Oncol, Kyoto, Japan
[14] Aichi Canc Ctr Hosp, Dept Radiat Oncol, Nagoya, Japan
[15] Kochi Univ Hosp, Dept Radiat Oncol, Kochi, Japan
[16] Showa Univ, Dept Radiat Oncol, Sch Med, Tokyo, Japan
[17] Hiroshima Univ, Grad Sch Biomed Sci, Dept Radiat Oncol, 1-2-3, Kasumi,Minami Ku, Hiroshima 7348551, Japan