CHINESE JOURNAL OF EPIDEMIOLOGY, Volume 24, Issue 12,2003, Pages 1129-1131, doi:10.3760/j.issn:0254-6450.2003.12.018
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CHINESE JOURNAL OF EPIDEMIOLOGY, Volume 24, Issue 12,2003, Pages 1153-1157, doi:10.3760/j.issn:0254-6450.2003.12.024
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CHINESE JOURNAL OF EPIDEMIOLOGY, Volume 24, Issue 12,2003, Pages 1107-1107, doi:10.3760/j.issn:0254-6450.2003.12.030