[1] Nordsjaellands Hosp, Dept Publ Hlth, Hillerod, Denmark
[2] Nordsjaellands Hosp, Natl Res Ctr Working Environm, Hillerod, Denmark
[3] Nordsjaellands Hosp, Dept Neurol, Hillerod, Denmark
[4] Frederiksberg & Bispebjerg Hosp, Dept Occupat & Environm Med, Frederiksberg, Denmark
[5] Univ Copenhagen, Dept Psychol, Copenhagen, Denmark
[6] Univ Southern Denmark, Inst Clin Res, Res Unit Clin Epidemiol, Odense, Denmark
[7] Odense Univ Hosp, Ctr Clin Epidemiol, Odense, Denmark
[8] Aarhus Univ Hosp, Danish Ramazzini Ctr, Dept Occupat Med, Aarhus, Denmark