1. RAND Corporation, Arlington, VA, USA
2. RAND Corporation, Santa Monica, CA, USA
3. Harvard Medical School, Boston, MA, USA
4. UCLA Department of Medicine, Los Angeles, CA, USA
5. Centers for Medicare & Medicaid Services, Baltimore, MD, USA
6. The Severyn Group, Ashburn, VA, USA
7. Massachusetts General Hospital, Boston, MA, USA
8. Yale School of Public Health, New Haven, CT, USA