.[J].Chinese Journal of Radiological Medicine and Protection,1993,13(1):49-51
Received:July 29, 1991  
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FundProject:国家自然科学基金资助
Author NameAffiliation
姜鸿 北京协和医院耳鼻咽喉科, 北京 100730 
倪道凤 北京协和医院耳鼻咽喉科, 北京 100730 
王直中 北京协和医院耳鼻咽喉科, 北京 100730 
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