1 Centers for Disease Control and Prevention, National Center for Chronic Disease Prevention and Health Promotion, Division of Population Health, Healthy Aging Branch, Atlanta, Georgia.
2 4770 Buford Hwy, Mailstop S107-6, Atlanta, GA 30341 (epq5@cdc.gov).
3 Centers for Disease Control and Prevention, National Center for Environmental Health, Division of Environmental Health Science and Practice, Asthma and Air Quality Branch, Atlanta, Georgia.
4 Centers for Disease Control and Prevention, National Center for Environmental Health, Atlanta, Georgia.
5 Centers for Disease Control and Prevention, National Center for Environmental Health, Division of Environmental Health Science and Practice, Atlanta, Georgia.