1. Division of Pulmonary and Critical Care Medicine, Department of Medicine, Northwestern University Feinberg School of Medicine, Chicago, Illinois (G.Y.L., D.M., P.H.S.S.)
2. Division of Cardiology, Department of Medicine, and Department of Preventive Medicine, Northwestern University Feinberg School of Medicine, Chicago, Illinois (S.S.K.)
3. Department of Preventive Medicine, Northwestern University Feinberg School of Medicine, Chicago, Illinois (L.A.C.)
4. Applied Chest Imaging Laboratory and Division of Pulmonary and Critical Care Medicine, Brigham and Women's Hospital, Boston, Massachusetts (G.R.W.)
5. Division of Epidemiology and Community Health, School of Public Health, University of Minnesota, Minneapolis, Minnesota (D.R.J.)
6. Lung Health Center, University of Alabama at Birmingham, Birmingham, Alabama (M.T.D.)
7. Division of Pulmonary and Critical Care Medicine, Department of Medicine, and Department of Preventive Medicine, Northwestern University Feinberg School of Medicine, Chicago, Illinois (M.R.C., R.K.).