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Hits 1600  Download times 1686  Received:February 24, 2004  
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DOI   10.11656/j.issn.1672-1519.2004.04.31
Key Words   
Author NameAffiliation
孙乐 天津南开医院, 天津, 300100 
张津平 天津南开医院, 天津, 300100 
Abstract
    

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