1. Division of Pulmonary, Critical Care, and Sleep Medicine, Medical College of Wisconsin, Milwaukee, Wisconsin
2. Froedtert Hospital, Milwaukee, Wisconsin
3. Health Policy, Quality, and Informatics Program, Center for Innovations in Quality, Effectiveness and Safety, Michael E. DeBakey Veterans Affairs Medical Center, Houston, Texas; and
4. Department of Medicine, Section of Health Services Research, Baylor College of Medicine, Houston, Texas