1. Yamanashi Institute for Public Health, 1-7-31 Fujimi, Kofu, Yamanashi 400, Japan
2. The Yamanashi Industrial Technology Center, 2617 Katsunuma, Higashiyamanashi, Yamanashi 409-13, Japan
3. Faculty of Pharmaceutical Science, Hoshi University, Ebara 2-4-41, Shinagawa-ku, Tokyo 142, Japan