Affiliation: | 1. Center for Tobacco Research and Intervention, School of Medicine and Public Health, University of Wisconsin, Madison, WI, USA;2. Department of Medicine, University of Wisconsin, Madison, WI, USA;3. The Methodology Center, The Pennsylvania State University, University Park, PA, USA;4. William S. Middleton Memorial Veterans Hospital, Madison, WI, USA;5. Department of Biobehavioral Health and Human Development, The Pennsylvania State University, University Park, PA, USA |