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Hits 1147  Download times 1712  Received:October 19, 2000  
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DOI   10.11656/j.issn.1672-1519.2001.02.23
Key Words   
Author NameAffiliation
李慧敏 528400 广东省中山市妇幼保健院 
林迤逦 528400 广东省中山市妇幼保健院 
杨华姿 528400 广东省中山市妇幼保健院 
Abstract
    

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