1. Department of Environmental Health Sciences, University of Michigan School of Public Health, Ann Arbor, Michigan, USA
2. Department of Animal and Food Sciences, University of Kentucky, Lexington, Kentucky, USA
3. Department of Epidemiology, Michigan State University, East Lansing, Michigan, USA
4. Department of Obstetrics and Gynecology, Wayne State University, Detroit, Michigan, USA
5. Grand Rapids Fertility and IVF, Grand Rapids, Michigan, USA