[1] Massachusetts General Hospital,Tobacco Research and Treatment Center, Division of General Internal Medicine, and Mongan Institute, Department of Medicine
[2] Harvard Medical School,Department of Medicine
[3] Vanderbilt University Medical Center,Institute for Global Health
[4] Vanderbilt University Medical Center,Department of Medicine, Center for Research on Health Care
[5] University of Pittsburgh School of Medicine,undefined
[6] Veterans Health Administration-Tennessee Valley Healthcare System Geriatric Research,undefined
[7] Education and Clinical Center (GRECC),undefined