1. Division of Pathology, National Institute of Health Sciences
2. Toxicology Research Department, Pharmaceutical Development Research Laboratories, Teijin Pharma Limited
3. Laboratory of Veterinary Pharmacology, School of Veterinary Medicine Azabu University
4. Present address: Food Safety Commission Secretariat, Cabinet Office
5. Division of Toxicology, National Institute of Health Sciences
6. Food safety commission of Japan