- Correspondence to Dr Jiaying Zhao, The Institute for Asian Demographic Research, School of Sociology and Political Science, Shanghai University, No 99, Shangda Road, Shanghai 200444, China;
- Received August 31, 2015
- Revised February 20, 2016
- Accepted March 16, 2016
- First published April 5, 2016.
If you wish to reuse any or all of this article please use the link below which will take you to the Copyright Clearance Center’s RightsLink service. You will be able to get a quick price and instant permission to reuse the content in many different ways.