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Authors
Yang, Qing-hui
Zhang, Wen
Liu, Qing-xin
Liu, Ling-xiao
Wu, Lin-lin
Wang, Jian-hua
Yan, Zhi-ping
Luo, Jian-jun
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Funding
Funding for this research was provided by:
Advanced and Appropriate Technique Generalization from Shanghai Health and Family Planning Committee (2013SY060)
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