[1] Univ British Columbia, Dept Med, Vancouver, BC, Canada
[2] Univ British Columbia, Sch Populat & Publ Hlth, Vancouver, BC V5Z 1M9, Canada
[3] Simon Fraser Univ, Dept Mol Biol & Biochem, Burnaby, BC V5A 1S6, Canada
[4] Environm Canada, Toronto, ON, Canada
[5] Univ British Columbia, Dept Med Genet, Vancouver, BC, Canada
[6] AllerGen NCE Allergy Genes & Environm Network, Hamilton, ON, Canada
[7] Simon Fraser Univ, Dept Hlth Sci, Burnaby, BC V5A 1S6, Canada
[8] McMaster Univ, Dept Med, Hamilton, ON, Canada