1. 1Department of Family and Community Medicine, Virginia Tech Carilion School of Medicine, Roanoke, Virginia.
2. 2Department of Obstetrics and Gynecology, Virginia Tech Carilion School of Medicine, Roanoke, Virginia.
3. 3Virginia Health Information, Richmond, Virginia.
4. 4Department of Medicine, Carilion Clinic.
5. 5The Robert Graham Center, Washington, District of Columbia.
6. 6Department of Family Medicine and Population Health, Virginia Commonwealth University, Richmond, Virginia.
7. 7Division of Internal Medicine and Health Services Research, David Geffen School of Medicine, UCLA, Los Angeles, California.
8. 8Center for Value-Based Insurance Design, Department of Internal Medicine, University of Michigan, Ann Arbor, Michigan.