1. Institute of Behavioral Science, University of Colorado, Boulder, CO, USA
2. Department of Sociology, University of Colorado, Boulder, CO, USA
3. Carolina Population Center, University of North Carolina, Chapel Hill, NC, USA
4. Department of Sociology, University of North Carolina, Chapel Hill, NC, USA
5. Center for Economic and Social Research, University of Southern California, Los Angeles, CA, USA
6. Department of Sociology & Spatial Sciences, University of Southern California, Los Angeles, CA, USA