1. Division of Pathology, National Institute of Health Sciences, 3-25-26 Tonomachi, Kawasaki-shi, Kanagawa 210-9501, Japan
2. Nagano Toxicologic-Pathology Consulting, 467-7 Ojiri, Hadano-shi, Kanagawa 257-0011, Japan
3. Division of Risk Assessment, National Institute of Health Sciences, 3-25-26 Tonomachi, Kawasaki-shi, Kanagawa 210-9501, Japan
4. Association for Promotion of Research on Risk Assessment, 1-134 Arako, Nakagawa-ku, Nagoya 454-0869, Japan