CHINESE JOURNAL OF RADIOLOGICAL MEDICINE AND PROTECTION, Volume 23, Issue 6,2003, Pages 462-465, doi:10.3760/cma.j.issn.0254-5098.2003.06.032
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CHINESE JOURNAL OF RADIOLOGICAL MEDICINE AND PROTECTION, Volume 23, Issue 6,2003, Pages 415-417, doi:10.3760/cma.j.issn.0254-5098.2003.06.008