1. Center for Clinical Management Research, Veterans Affairs Ann Arbor Healthcare System, Ann Arbor, Michigan
2. Department of Internal Medicine, University of Michigan Medical School, Ann Arbor
3. Ann Arbor Veterans Affairs Medical Center/University of Michigan Patient Safety Enhancement Program, Ann Arbor
4. Center for Innovations in Quality, Effectiveness and Safety, Michael E. DeBakey Veterans Affairs Medical Center, Houston, Texas
5. Department of Internal Medicine, Baylor College of Medicine, Houston, Texas
6. Department of Urology, University of Michigan Medical School, Ann Arbor