1. Division of Medical DevicesNational Institute of Health Sciences Tokyo158‐8501 Japan
2. Department of BioengineeringThe University of Tokyo Graduate Schools of Engineering and Medicine Tokyo113‐0033 Japan
3. Research DepartmentPublic Welfare Institute of Scientific Research Foundation Tokyo184‐0015 Japan
4. Department of Dental EducationKanagawa Dental University Kanagawa238‐8580 Japan
5. Division of PathologyNational Institute of Health Sciences Tokyo158‐8501 Japan
6. Division of Environmental ChemistryNational Institute of Health Sciences Tokyo158‐8501 Japan
7. Corporate Research and Development DivisionKawasumi Laboratories Tokyo108‐6109 Japan
8. Department of PharmacologyNational Research Institute for Child Health and Development Tokyo157‐8535 Japan
9. New Japan Chemical Co., Ltd.Osaka541‐0051 Japan