1. Margolis Center for Health Policy, Duke University, Durham, North Carolina.
2. Department of Statistical Sciences, Duke University, Durham, North Carolina.
3. Hospice Analytics, Colorado Springs, Colorado.
4. Department of Population Health Sciences, Duke University School of Medicine, Durham, North Carolina.
5. School of Information Sciences, Wayne State University, Detroit, Michigan.
6. Duke Network Analysis Center, Social Science Research Institute, Duke University, Durham, North Carolina.
7. Sanford School of Public Policy, Duke University, Durham, North Carolina.
8. Department of Medicine, Duke University School of Medicine, Durham, North Carolina.