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Hits 1262  Download times 1189  Received:March 02, 2000  
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DOI   10.11656/j.issn.1673-9043.2000.02.30
Key Words   
Author NameAffiliation
师军华 天津市塘沽医院 300450 
张秀娟 天津市塘沽医院 300450 
刘洪涛 天津市塘沽医院 300450 
Abstract
    

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