1 Centers for Disease Control and Prevention, National Center for Chronic Disease Prevention and Health Promotion, Office on Smoking and Health, Epidemiology Branch, Atlanta, GA, 30341-3717.
2 Social Science Research Center, Mississippi State University, Starkville, MS, 39759.
3 Survey and Evaluation Research Laboratory, Virginia Commonwealth University, Richmond, VA, 23284-3016.
4 Centers for Disease Control and Prevention, National Center for Chronic Disease Prevention and Health Promotion, Office of the Director, Extramural Research Program Office, Atlanta, GA, 30341-3717.