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Hits 1345  Download times 1016  Received:December 15, 1998  
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DOI   10.11656/j.issn.1672-1519.1999.02.21
Key Words   
Author NameAffiliation
何静 天津市安定医院 300074 
李宝霞 天津市安定医院 300074 
Abstract
    

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