1. Department of Pharmaceutical Sciences, Daiichi University of Pharmacy, Fukuoka 815-8511, Japan
2. Department of Health and Environmental Sciences, Graduate School of Medicine, Kyoto University, Kyoto 606-8501, Japan
3. Department of Sanitary Technology, West China School of Public Health, Sichuan University, No. 16, Renmin South Road, Chengdu 610041, China