1. Center for Tobacco Studies, Rutgers Biomedical and Health Sciences, New Brunswick, NJ
2. Department of Health Behavior, Society and Policy, Rutgers School of Public Health, Piscataway, NJ
3. Department of Epidemiology and Biostatistics, Graduate School of Public Health and Health Policy, The City University of New York, New York, NY
4. Department of Epidemiology, Mailman School of Public Health, Columbia University, New York, NY