1. Philip R. Lee Institute for Health Policy Studies, University of California, San Francisco, CA, USA
2. Sanford School of Public Policy, Duke University, Durham, NC, USA
3. School of Medicine, University of California, San Francisco, USA
4. Department of Economics, Duke University, Durham, North Carolina, USA
5. Margolis Center for Health Policy, Duke University, Durham, North Carolina, USA
6. Department of Medicine, University of California, San Francisco, USA
7. Department of Epidemiology & Biostatistics, University of California, San Francisco, USA
8. Duke University, Durham, North Carolina, USA
9. Center for Healthcare Value, University of California, San Francisco, USA