By Xu Longgen   Yang Yirong   Shi Jian Guo   Wang Hongwei   Qiu Feng   Peng Wanling   Fu Jing   Zhu Xiaofeng   Zhu Youhua   in The European Journal of Contraception and Reproductive Health Care

ISSN:1473-0782|16|4|270-276

Informa Healthcare‎(2011)‎

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