1. Clinical Pharmacology Program, Division of Cardiology, Department of Medicine, University of California, San Francisco, California 94143, United States
2. Department of Psychiatry and Behavioral Sciences and Masonic Cancer Center, University of Minnesota, Minneapolis, Minnesota 55455, United States
3. School of Public Health of Mexico, National Institute of Public Health, 62100 Cuernavaca, Morelos, Mexico
4. Tobacco Center of Regulatory Science, Department of Psychiatry and Abramson Cancer Center, University of Pennsylvania, Philadelphia, Pennsylvania 19104, United States