1 Department of Health Policy and Management, Gillings School of Global Public Health, The University of North Carolina at Chapel Hill, 1103E McGavran-Greenberg, 135 Dauer Drive, Campus Box 7411, Chapel Hill, NC, 27599-7411, USA. birken@unc.edu.
2 L. Douglas Wilder School of Government and Public Affairs, Virginia Commonwealth University, Richmond, VA, USA.
3 Institute for Patient-Centered Initiatives & Health Equity, The George Washington University Cancer Center, Washington, DC, USA.
4 Department of Health Policy and Management, Gillings School of Global Public Health, The University of North Carolina at Chapel Hill, 1103E McGavran-Greenberg, 135 Dauer Drive, Campus Box 7411, Chapel Hill, NC, 27599-7411, USA.