1. Division of Environmental Health Science and Practice, National Center for Environmental Health, U.S. Centers for Disease Control and Prevention, Atlanta, Georgia, USA
2. Department of Population Science, American Cancer Society, Atlanta, Georgia, USA
3. Division of Cancer Prevention and Control, National Center for Chronic Disease Prevention and Health Promotion, U.S. Centers for Disease Control and Prevention, Atlanta, Georgia, USA
4. Epidemic Intelligence Service, Center for Surveillance, Epidemiology and Laboratory Services, U.S. Centers for Disease Control and Prevention, Atlanta, Georgia, USA