1. Department of Internal Medicine, University of Michigan, Ann Arbor, MI.
2. Department of Emergency Medicine, University of Michigan, Ann Arbor, MI.
3. Division of Pulmonary & Critical Care Medicine, Covenant Healthcare, Saginaw, MI.
4. Division of Hospital Medicine, Henry Ford Hospital, Detroit, MI.
5. Division of Pulmonary & Critical Care Medicine, University of Michigan, Ann Arbor, MI.
6. Quality and Patient Safety Program, University of Michigan, Ann Arbor, MI.
7. Veterans Affairs Center for Clinical Management Research, Ann Arbor, MI.