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DOI   10.11656/j.issn.1672-1519.2007.02.37
Key Words   
Author NameAffiliation
刘笑梅 天津市南开医院妇产科, 天津, 300191 
曹保利 天津市南开医院妇产科, 天津, 300191 
贾立蓉 天津市南开医院妇产科, 天津, 300191 
李萍 天津市南开医院妇产科, 天津, 300191 
Abstract
    

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