[1] Hillerod Hosp, Clin Occupat Med, DK-3400 Hillerod, Denmark
[2] Bispebjerg Hosp, Clin Occupat & Environm Med, DK-2400 Copenhagen, Denmark
[3] Herlev Hosp, Dept Cardiol, DK-2730 Herlev, Denmark
[4] Task Consult, Gilleleje, Denmark
[5] UCL, Dept Epidemiol & Publ Hlth, London, England
[6] Karolinska Inst, Inst Stress Res, Stockholm, Sweden