1. Department of Internal Medicine,
2. Department of Environmental Health Sciences,
3. Department of Obstetrics and Gynecology, and
4. Division of Clinical Pathology, Department of Pathology, University of Michigan, Ann Arbor, Michigan, USA
5. Faculty of Agricultural and Environmental Sciences, McGill University, Montreal, Quebec, Canada
6. Department of Biostatistics,
7. Department of Family Medicine, and
8. Department of Epidemiology, University of Michigan, Ann Arbor, Michigan, USA