1. Department of Medicine and
2. Measurement Science Quality Enhancement Research Initiative, San Francisco Veterans Affairs Health Care System, San Francisco, California;
3. Michael E. DeBakey VA Medical Center Health Services Research & Development Center for Innovations in Quality, Effectiveness and Safety, Houston, Texas;
4. Section of Health Services Research and
5. Section of Pulmonary, Critical Care and Sleep Medicine, Department of Medicine, Baylor College of Medicine, Houston, Texas;
6. Department of Medicine, University of Colorado, Aurora, Colorado; and
7. Division of Pulmonology and Critical Care Medicine, Weill-Cornell Medical Center, Cornell University, New York, New York
8. Department of Epidemiology and Biostatistics, University of California, San Francisco, San Francisco, California;