1 Duke University School of Medicine and Duke-Margolis Center for Health Policy, Duke University, Durham, North Carolina.
2 Center for Advanced Hindsight, Duke University, Durham, North Carolina.
3 University of Washington School of Medicine, Seattle, Washington.
4 Stanford University School of Medicine, Palo Alto, California.
5 Duke-Margolis Center for Health Policy, Duke University, Durham, North Carolina.
6 Duke University School of Medicine, Duke-Margolis Center for Health Policy, Fuqua School of Business, and Sanford School of Public Policy, Duke University, Durham, North Carolina.