.[J].Chinese Journal of Radiological Medicine and Protection,1999,19(1):43-45
Received:October 15, 1998  Revised:December 25, 1998
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杨志祥 100039 北京北太平路医院 
孙向黎 100039 北京北太平路医院 
杨文峰 100039 北京北太平路医院 
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