,et al.[J].Chinese Journal of Radiological Medicine and Protection,1989,9(S1):90-93
  
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张金拴 河南省职业病防治所, 郑州 
姚仲甫 河南省职业病防治所, 郑州 
李俊杰 河南省职业病防治所, 郑州 
杨顺勤 河南省职业病防治所, 郑州 
石爱英 河南省职业病防治所, 郑州 
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