.[J].Chinese Journal of Radiological Medicine and Protection,2001,21(4):249
Received:March 25, 2001  
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王子文 075000 张家口, 中国人民解放军第二五一医院老年病科 
郭爱云 075000 张家口, 中国人民解放军第二五一医院老年病科 
郭晓明 075000 张家口, 中国人民解放军第二五一医院老年病科 
王玉玲 075000 张家口, 中国人民解放军第二五一医院老年病科 
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