Institution: | (1) Department of Occupational Health, Osaka Prefectural Institute of Public Health, Nakamichi 1-3-69, Higashinari-ku, 537-0025, Osaka, Japan e-mail: hirata@iph.pref.osaka.jp Tel.: +81-6-69721321; Fax: +81-6-69722393, JP;(2) Department of Public Health, Nagoya University School of Medicine, Nagoya, Japan, JP;(3) Formerly of the Department of Public Health, Nagoya University School of Medicine, Nagoya, Japan, JP;(4) Kyushu Research Institute for Social Medicine, Ohmuta, Japan, JP;(5) Tokushima Kensei Hospital, Tokushima, Japan, JP;(6) Kochi Seikyo Hospital, Kochi, Japan, JP;(7) Koyo Seikyo Hospital, Fukui, Japan, JP |