1. Center for Tobacco Research and Intervention, University of Wisconsin, Ste. 200, Madison, WI, USA
2. William S. Middleton Memorial Veterans Hospital, 2500 Overlook Terrace, Madison, WI, USA
3. Department of Psychology, University of Cincinnati, Cincinnati, OH, USA
4. Department of Psychological and Brain Sciences, University of Louisville, Louisville, KY, USA
5. Department of Neurology, Gardner Neuroscience Institute, University of Cincinnati, Suite 2300, Cincinnati, OH, USA
6. Department of Psychiatry, Harvard Medical School/MGH, Boston, MA, USA