1. Department of Obstetrics and Gynecology, Royal Victoria Hospital Research Institute of McGill University Health Centre Montreal QC Canada
2. Department of Epidemiology, Biostatistics, and Occupational Health McGill University Montreal QC Canada
3. Biostatistics and Computational Biology Branch National Institute of Environmental Health Sciences, NIH Research Triangle Park North Carolina
4. Social & Scientific Systems Inc. Durham North Carolina
5. Epidemiology Branch National Institute of Environmental Health Sciences, NIH Research Triangle Park North Carolina