1. Division of Pulmonary and Critical Care Medicine, Department of Medicine
2. Division of General Internal Medicine, Department of Medicine
3. The Joint Commission, Oakbrook Terrace, Illinois; and
4. Division of Infectious Diseases, Department of Internal Medicine, University of Michigan, Ann Arbor, Michigan
5. Medical Scientist Training Program, and
6. Biostatistics Core Facility, Robert H. Lurie Comprehensive Cancer Center, Department of Preventive Medicine, Feinberg School of Medicine, Northwestern University, Chicago, Illinois