1 Division of Rheumatology, Cumming School of Medicine, University of Calgary, Calgary, AB, Canada. Electronic address: aeclarke@ucalgary.ca.
2 Department of Geography and Environmental Management, University of Waterloo, Waterloo, ON, Canada.
3 Division of Clinical Epidemiology, Department of Medicine, McGill University Health Centre, Montreal, QC, Canada.
4 Division of Allergy and Immunology, Department of Pediatrics, University of British Columbia, Vancouver, BC, Canada.
5 Bureau of Chemical Safety, Health Canada, Ottawa, ON, Canada.
6 Division of Allergy and Clinical Immunology, Department of Pediatrics, Montreal Children's Hospital, McGill University Health Centre, Montreal, QC, Canada.