[1] Univ Occupat & Environm Hlth, Dept Orthoped, 1-1 Iseigaoka, Kitakyushu, Fukuoka 8078555, Japan
[2] Univ Occupat & Environm Hlth, Sch Med, Dept Prevent Med & Community Hlth, 1-1 Iseigaoka, Kitakyushu, Fukuoka 8078555, Japan
[3] Hiroshima Univ, Grad Sch Biomed & Hlth Sci, Dept Publ Hlth & Hlth Policy, Minami Ku, 1-2-3 Kasumi, Hiroshima 7340037, Japan
[4] Univ Occupat & Environm Hlth, Wakamatsu Hosp, Dept Orthoped, 1-17-1 Hamamachi, Kitakyushu, Fukuoka 8080024, Japan
[5] Univ Occupat & Environm Hlth, Inst Ind Ecol Sci, Dept Environm Epidemiol, 1-1 Iseigaoka, Kitakyushu, Fukuoka 8078555, Japan