1. Sanford School of Public Policy and Duke University Population Research Institute, Duke University, Durham, NC, USA
2. Department of Sociology and Duke University Population Research Institute, Duke University, Durham, NC, USA
3. Department of Sociology and Criminology, Pennsylvania State University, State College, PA, USA; Population Research Institute, Pennsylvania State University, University Park, PA, USA
4. Duke University Population Research Institute, Duke University, Durham, NC, USA