Su, Peng
Ding, Hansheng
Zhang, Wei
Duan, Guangfeng
Yang, Yitong
Chen, Rong
Duan, Zengjie
Du, Lixia
Xie, Chunyan
Jin, Chunlin
Hu, Chaoqun
Sun, Zixue
Long, Junrui
Gong, Lingling
Tian, Wenhua
Funding for this research was provided by:
National Natural Science Foundation of China (71373279, 71073104)
Three-year Action Plan Project of Shanghai Health and Family Planning Commission (No. 43)