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Hits 1138  Download times 1710  Received:February 20, 2002  
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DOI   10.11656/j.issn.1673-9043.2002.03.06
Key Words   
Author NameAffiliation
王健 天津市西青妇幼保健院 300122 
朱颖 天津中医学院第一附属医院 300193 
Abstract
    

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