[1] Kitasato Univ, Dept Radiat Oncol, Sch Med, Sagamihara, Kanagawa, Japan
[2] Kitasato Univ, Dept Urol, Sch Med, Sagamihara, Kanagawa, Japan
[3] Kitasato Univ, Sch Allied Hlth Sci, Dept Med Engn & Technol, Sagamihara, Kanagawa, Japan
[4] Kitasato Univ, Grad Sch Med Sci, Sagamihara, Kanagawa, Japan
[5] Canc Inst Hosp, Dept Radiat Oncol, Koto Ku, Tokyo, Japan