aThe Children's Hospital Research Institute of Manitoba

bDepartment of Pediatrics and Child Health

cDepartment of Food and Human Nutritional Science, University of Manitoba

dGeorge and Fay Yee Centre for Healthcare Innovation, Winnipeg, Manitoba, Canada

eInstitute of Environmental Medicine, Karolinska Institutet, Stockholm, Sweden

Correspondence to Michael A. Golding, 506-715 McDermot Avenue, Winnipeg, MB, Canada R3E 3P4. Tel: +1 506 608 5376; e-mail: [email protected]