1. RAND Corporation, Boston, Massachusetts2Division of General Internal Medicine and Primary Care, Brigham and Women’s Hospital, Boston, Massachusetts
2. Leonard D. Schaeffer Center for Health Policy and Economics, University of Southern California, Los Angeles
3. Leonard D. Schaeffer Center for Health Policy and Economics, University of Southern California, Los Angeles4Department of Health Policy and Management, Sol Price School of Public Policy, University of Southern California, Los Angeles