1. Department of Radiation Oncology; Kawasaki Medical School; 577 Matsushima Kurashiki, Okayama 701-0192 Japan
2. Department of Dermatology; Kawasaki Medical School; Kurashiki, Okayama 701-0192 Japan
3. Particle Radiation Oncology; Kyoto University Research Reactor Institute; Osaka 590-0494 Japan
4. Department of Pathology; The Ohio State University; Columbus OH 43210 USA