Song, Shangjin
Yu, Jiahui
Ruan, Yi
Liu, Xuan
Xiu, Lijuan
Yue, Xiaoqiang
Funding for this research was provided by:
Shanghai Municipal Population and Family Planning Commission (NO.ZY3-CCCX-3-3038)
National Natural Science Foundation of China (81603434)
Article History
Received: 11 November 2017
Accepted: 25 February 2018
First Online: 21 March 2018
Compliance with ethical standards
:
: The authors declare that they have no conflict of interest.