1. Department of Psychiatry Shizuoka Saiseikai General Hospital 1‐1‐1, Oshika, Suruga‐ku Shizuoka 422‐8527 Japan
2. Hakuju Institute for Health Science Co., Ltd. 1‐37‐5, Tomigaya, Shibuya‐ku Tokyo 151‐0063 Japan
3. Bio‐Self‐Regulating Science Laboratory Obihiro University of Agricultural and Veterinary Medicine Inada‐cho Obihiro Hokkaido 080‐8555 Japan