1 1Division of Industrial Toxicology and Health Effects Research, National Institute of Occupational Safety and Health, 6-21-1 Nagao, Tama-ku, Kawasaki, Kanagawa 214-8585 Japan.
2 2Present address: Graduate School of Biomedical and Health Sciences, Hiroshima University, Hiroshima, 734-8553 Japan.
3 3Present Address: Department of Health Science, Yokohama University of Pharmacy, Yokohama, 245-0066 Japan.
4 4Division of Human Environmental Science, Mount Fuji Research Institute, Yamanashi Prefectural Government, 5597-1 Kenmarubi, Kamiyoshida, Fujiyoshida, Yamanashi, 403-0005 Japan.
5 5Present Address: Department of Sport and Medical Science, Faculty of Medical Technology, Teikyo University, Hachioji, Tokyo, 192-0835 Japan.