Published on in Vol 13, No 4 (2011): Oct-Dec
1 Schroeder Institute for Tobacco Research and Policy Studies, American Legacy Foundation, Washington, DC, United States
2 Division of Pulmonary & Critical Care, Department of Medicine, Georgetown University Medical Center, Washington, DC, United States
3 Department of Oncology, Georgetown University Medical Center / Lombardi Comprehensive Cancer Center, Washington, DC, United States
4 Department of Health, Behavior and Society, Johns Hopkins Bloomberg School of Public Health, Baltimore, MD, United States
5 see acknowledgements, Washington, DC, United States