[1] Karolinska Inst, Med, Stockholm, Sweden
[2] Karolinska Inst, Dent Med, Stockholm, Sweden
[3] Karolinska Inst, Inst Environm Med, Stockholm, Sweden
[4] Clin Sci Danderyds Hosp, Karolinska Inst, Stockholm, Sweden
[5] Royal Inst Technol, Ctr Safety Res, Stockholm, Sweden
[6] Uppsala Univ, Med Sci, Uppsala, Sweden
[7] Umea Univ, Dept Publ Hlth & Clin Med, Umea, Sweden