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Hits 1280  Download times 916  Received:April 15, 1998  
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DOI   10.11656/j.issn.1672-1519.1999.02.20
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Author NameAffiliation
乔树芳 天津市长征医院 300021 
毛舒和 天津市长征医院 300021 
Abstract
    

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