1. Division of Pulmonary and Critical Care Medicine and
2. Department of Preventive Medicine, Northwestern University Feinberg School of Medicine, Chicago, Illinois
3. Division of Research, Kaiser Permanente of Northern California, Oakland, California
4. Division of Pulmonary, Allergy and Critical Care Medicine, and
5. Department of Preventive Medicine and Environmental Health, University of Kentucky College of Public Health, Lexington, Kentucky
6. Division of Epidemiology and Community Health, University of Minnesota School of Public Health, Minneapolis, Minnesota
7. Division of Preventive Medicine, University of Alabama-Birmingham, Birmingham, Alabama
8. Department of Internal Medicine, St. Barnabas Hospital, Bronx, New York; and
9. Division of Pulmonary and Critical Care, Brigham and Women’s Hospital, Boston, Massachusetts