1. Department of Sociology, University at Albany, SUNY, Albany, NY, USA
2. Department of Sociology, Center for Social and Demographic Analysis, University at Albany, SUNY, Albany, NY, USA
3. Department of Sociology, School of Humanities and Social Science of Xi'an Jiaotong University, Xi'an, Shaanxi Province, China
4. Department of Sociology and Social Work, University of Wisconsin-Stevens Point, Stevens Point, WI, USA