1. Division of Clinical Pharmacology and Experimental Therapeutics, Departments of Medicine and Biopharmaceutical Sciences; Center for Tobacco Control Research and Education, University of California San Francisco, San Francisco, CA
2. Division of Laboratory Sciences, National Center for Environmental Health, Centers for Disease Control and Prevention, Atlanta, GA
3. Departments of Public Health Sciences and Psychiatry, Penn State College of Medicine, Hershey, PA
4. Departments of Laboratory Medicine and Pathology, Pharmacology, and Medicinal Chemistry, University of Minnesota, Masonic Cancer Center, Minneapolis, MN
5. Departments of Medicine and Psychiatry, University of California San Francisco, San Francisco, CA
6. Department of Behavioural Science and Health, University College London, London, UK
7. Department of Medicine, University of Minnesota Medical School, Minneapolis, MN
8. Department of Medicine, University of Connecticut, Farmington, CT
9. Center for Tobacco Research and Intervention, Department of Medicine, School of Medicine and Public Health, University of Wisconsin, Madison, WI