1. Department
of Medicinal Chemistry and Masonic Cancer Center, University of Minnesota, Minneapolis, Minnesota 55455, United States
2. Division
of Biostatistics, School of Public Health, University of Minnesota, Minneapolis, Minnesota 55455, United States
3. Division
of Environmental Health Sciences, Wadsworth Center, New York State Department of Health, Albany, New York 12201, United States
4. Tobacco
Use Programs, University of Minnesota, Minneapolis, Minnesota 55455, United States