1. Center for Tobacco Research and Intervention University of Wisconsin School of Medicine and Public Health Madison WI USA
2. Department of Medicine University of Wisconsin School of Medicine and Public Health Madison WI USA
3. William S. Middleton Memorial Veterans Hospital Madison WI USA
4. Department of Social and Behavioral Sciences, School of Global Public Health New York University New York NY USA
5. Department of Educational Psychology University of Wisconsin WI USA
6. Institute for Health Research and Policy University of Illinois at Chicago Chicago IL USA