1. Pulmonary, Allergy, Critical Care, and Sleep Medicine, Minneapolis VA Health Care System, Minneapolis, Minnesota
2. Pulmonary, Allergy, Critical Care, and Sleep Medicine, University of Minnesota, Minneapolis
3. Center for Care Delivery and Outcomes Research, Minneapolis VA Health Care System, Minneapolis, Minnesota
4. General Internal Medicine, Minneapolis VA Health Care System, Minneapolis, Minnesota
5. Division of Biostatistics, University of Minnesota, Minneapolis
6. Division of Health Policy and Management, University of Minnesota, Minneapolis
7. Cardiology, Minneapolis VA Health Care System, Minneapolis, Minnesota