.[J].Chinese Journal of Radiological Medicine and Protection,2012,32(6):649-651
Received:February 28, 2012  
DOI：10.3760/cma.j.issn.0254-5098.2012.06.026
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张继勉 300011 天津市疾病预防控制中心 
牛振 300011 天津市疾病预防控制中心 
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