1. a Department of Forensic Medicine , Tokyo Medical College , 6-1-1 Shinjuku, Shinjuku, Tokyo, 160, Japan
2. b Tokyo Medical Examiner's Office , 4-21-18 Otsuka, Bunkyo, Tokyo, 112, Japan
3. c Division of Organic Chemistry , National Institute of Health Sciences , 1-18-1 Kamiyoga, Setagaya, Tokyo, 158, Japan