1. The Schroeder Institute for Tobacco Research and Policy Studies, Legacy; Washington DC USA
2. Department of Health, Behavior and Society, Johns Hopkins Bloomberg School of Public Health; Baltimore MD USA
3. Office of Science, Center for Tobacco Products, Food and Drug Administration; Silver Spring MD USA
4. Westat; Rockville MD USA
5. Department of Oncology, Lombardi Comprehensive Cancer Center; Georgetown University Medical Center; Washington DC USA
6. Department of Psychiatry and Behavioral Sciences; Medical University of South Carolina; Charleston SC USA
7. Department of Health Behavior, Division of Cancer Prevention and Population Sciences; Roswell Park Cancer Institute; Buffalo NY USA