[1] Univ Occupat & Environm Hlth, Inst Ind Ecol Sci, Dept Occupat Hlth Practice & Management, Kitakyushu, Fukuoka 8078555, Japan
[2] Univ Occupat & Environm Hlth, Occupat Hlth Training Ctr, Kitakyushu, Fukuoka 8078555, Japan
[3] Univ Occupat & Environm Hlth, Sch Med, Dept Publ Hlth, Kitakyushu, Fukuoka 8078555, Japan
[4] Univ Occupat & Environm Hlth, Sch Med, Dept Radiat Biol & Hlth, Kitakyushu, Fukuoka 8078555, Japan
[5] Univ Occupat & Environm Hlth, Div Infect Control & Prevent, Kitakyushu, Fukuoka 8078555, Japan
[6] Univ Occupat & Environm Hlth, Presidents Off, Kitakyushu, Fukuoka 8078555, Japan