1. Division of Reproductive Health, National Center for Chronic Disease Prevention and Health Promotion, Centers for Disease Control and Prevention, Atlanta, Georgia, USA.
2. Division of Epidemiology and Biostatistics, School of Public Health, University of Illinois at Chicago, Chicago, Illinois, USA.
3. Division of Community Health Sciences, School of Public Health, University of Chicago, Chicago, Illinois, USA.
4. Association of State and Territorial Health Officials, Arlington, Virginia, USA.