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Hits 1286  Download times 1276  Received:January 11, 2000  
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DOI   10.11656/j.issn.1672-1519.2000.03.17
Key Words   
Author NameAffiliation
左芳 天津市南开医院 300100
天津市中心妇产科医院 300052 
张丽蓉 天津市南开医院 300100
天津市中心妇产科医院 300052 
Abstract
    

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