| Institution: | 1. Center for Tobacco Research and Intervention, University of Wisconsin School of Medicine and Public Health, Madison, WI, USA;2. University of Wisconsin School of Medicine and Public Health, Department of Medicine, Madison, WI, USA;3. University of Wisconsin, Department of Educational Psychology, Madison, WI, USA;4. The Methodology Center, The Pennsylvania State University, University Park, PA, USA;5. University of Illinois at Chicago, Institute for Health Research and Policy, Chicago, IL, USA;6. William S. Middleton Memorial Veterans Hospital, Madison, WI, USA;7. University of Wisconsin, Department of Statistics, Madison, WI, USA |
