[1] University of North Carolina-Chapel Hill,Department of Health Policy and Management
[2] University of North Carolina-Chapel Hill,Cecil G. Sheps Center for Health Services Research
[3] University of North Carolina-Chapel Hill,School of Medicine and Department of Biostatistics
[4] CareFirst BlueCross BlueShield,UNC Faculty Physicians, Department of Practice Quality and Innovation
[5] UNC Health Care,Lineberger Comprehensive Cancer Center
[6] University of North Carolina-Chapel Hill,undefined