1. RAND Corporation, Santa Monica, California
2. Department of Biomedical Informatics, Harvard Medical School, Boston, Massachusetts
3. Department of Surgery, Beth Israel Deaconess Medical Center, Boston, Massachusetts
4. Aetna Inc, Hartford, Connecticut
5. Johns Hopkins University School of Medicine, Baltimore, Maryland
6. Johns Hopkins Bloomberg School of Public Health, Baltimore, Maryland
7. Department of Surgery, University of Florida, Jacksonville