[1] Natl Inst Occupat Safety & Hlth, Kawasaki, Kanagawa, Japan
[2] Univ Tokyo, Grad Sch Educ, Tokyo, Japan
[3] Univ Tokyo, Grad Sch Med, Tokyo, Japan
[4] Kitasato Univ, Grad Sch Med Sci, Sagamihara, Kanagawa, Japan
[5] Kitasato Univ, Sch Med, Dept Psychiat, Sagamihara, Kanagawa, Japan
[6] Jikei Univ, Sch Nursing, Fac Med, Tokyo, Japan
[7] RIKEN, Yokohama Branch, Occupat Hlth Ctr, Yokohama, Kanagawa, Japan