1. Department of Prevention and Community Health, George Washington University Milken Institute School of Public Health, Washington, DC, USA;
2. Department of Oncology, Georgetown University Medical Center, Washington, DC, USA;
3. Oklahoma Tobacco Research Center, University of Oklahoma Health Sciences Center, Oklahoma City, Oklahoma, USA;
4. Center for Tobacco Studies, Rutgers School of Public Health, Piscataway, New Jersey, USA;
5. Department of Population Health Sciences, Virginia Tech Carilion Research Institute, Virginia Tech, Roanoke, Virginia, USA