Yan, Yong
Zhou, Zhou
Kong, Fanzhi
Feng, Suibin
Li, Xuzhong
Sha, Yanhua
Zhang, Guangjun
Liu, Haijun
Zhang, Haiqing
Wang, Shiguang
Hu, Cheng
Zhang, Xueli
Funding for this research was provided by:
the Key Project of Shanghai Health and Family Planning Commission (Grant No. 201440026)