[1] Ctr Occupat & Environm Med, Stockholm, Sweden
[2] Inst Environm Med, Karolinska Inst, Stockholm, Sweden
[3] Univ Manitoba, Dept Pediat & Child Hlth, Winnipeg, MB, Canada
[4] George & Fay Yee Ctr Healthcare Innovat, Winnipeg, MB, Canada
[5] Soder Sjukhuset, Karolinska Inst, Dept Clin Sci & Educ, Stockholm, Sweden