1. Michigan State University, Department of Epidemiology, East Lansing, MI (current affiliation: Centers for Disease Control and Prevention, National Center for Chronic Disease Prevention and Health Promotion, Division of Reproductive Health, Atlanta, GA)
2. Michigan State University, Department of Geography, East Lansing, MI
3. Michigan Department of Community Health, Lansing, MI (current affiliation: Centers for Disease Control and Prevention, National Center for Chronic Disease Prevention and Health Promotion, Division of Reproductive Health, Atlanta, GA)
4. Michigan State University, Departments of Obstetrics, Gynecology & Reproductive Biology, and Epidemiology, East Lansing, MI
5. Michigan State University, Department of Epidemiology, Division of Biostatistics, East Lansing, MI
6. Michigan State University, Departments of Epidemiology and Pediatrics, East Lansing, MI