1. Epidemic Intelligence Service Officer, U.S. Public Health Service, Department of Health, Education and Welfare, Centers for Disease Control and Prevention (CDC), 4770 Buford Highway NE Mailstop F-39 Atlanta, GA 30341, US.
2. Division of Environmental Hazards and Health Effects, National Center for Environmental Health, Centers for Disease Control and Prevention (CDC), Atlanta, GA, US.
3. Office of the Director, Substance Abuse and HIV Prevention, Centers for Disease Control and Prevention (CDC), Atlanta, GA, US.