[1] SHS Aabenraa, Dept Med, DK-6200 Aabenraa, Denmark
[2] Univ So Denmark, Inst Reg Hlth Serv Res, Odense, Denmark
[3] Viborg Reg Hosp, Dept Med, Viborg, Denmark
[4] Danish Canc Soc Res Ctr, Copenhagen, Denmark
[5] Natl Res Ctr Working Environm, Copenhagen, Denmark
[6] Tech Univ Denmark, Natl Food Inst, Soborg, Denmark