Beth Israel Deaconess Medical Center, Boston, Massachusetts, United States
Virginia Mason Medical Center, Seattle, Washington, United States
California Pacific Medical Center, San Francisco, California, United States
Division of Infectious Diseases & HIV Medicine at Drexel University College of Medicine, Philadelphia, Pennsylvania, United States
Center for Interdisciplinary Research on Nicotine Addiction, University of Pennsylvania, Philadelphia, Pennsylvania, United States
University of Pennsylvania, Philadelphia, Pennsylvania, United States
Annenberg Public Policy Center, Philadelphia, Pennsylvania, United States
Lazenby Hall, Ohio State University, Columbus, Ohio, United States
University of Pennsylvania, Philadelphia, Pennsylvania, United States
Hospital of the University of Pennsylvania, Philadelphia, Pennsylvania, United States
Hospital of the University of Pennsylvania, Philadelphia, Pennsylvania, United States
Philadelphia VA Medical Center, Philadelphia, PA, Philadelphia, Pennsylvania, United States
University of Pennsylvania Treatment Research Center, Philadelphia, Pennsylvania, United States
Northwestern University, Chicago, Illinois, United States
University of Pennsylvania, Philadelphia, Pennsylvania, United States