1. Water and Air Quality Bureau, Health Canada, Ottawa, Ontario, Canada
2. Department of Pediatrics, Penn State College of Medicine, Pennsylvania State University, Hershey, Pennsylvania, USA
3. Environmental Health Sciences and Research Bureau, Health Canada, Ottawa, Ontario, Canada
4. Department of Obstetrics and Gynecology, Centre de Recherche du CHUS, University of Sherbrooke, Sherbrooke, Québec, Canada
5. School of Biological and Population Health Sciences, Oregon State University, Corvallis, Oregon, USA