[1] Gunma Univ, Grad Sch Med, Dept Radiat Oncol, Maebashi, Gumma 371, Japan
[2] Gunma Univ, Grad Sch Med, Dept Neurobiol & Behav, Maebashi, Gumma 371, Japan
[3] Gunma Univ, Grad Sch Med, Subdiv Quantum Biol, Maebashi, Gumma 371, Japan
[4] Japan Atom Energy Agcy, Microbeam Radiat Biol Grp, Takasaki, Gumma, Japan
[5] Gunma Univ, Grad Sch Med, Dept Quantum Biol, Maebashi, Gumma 371, Japan