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Hits 1243  Download times 1187  Received:March 01, 1999  
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DOI   10.11656/j.issn.1672-1519.1999.04.13
Key Words   
Author NameAffiliation
张晓兰 天津市河西医院300202 
李宝森 天津市妇幼保健所 
于祖茹 天津市妇幼保健所 
Abstract
    

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