CHINESE JOURNAL OF EPIDEMIOLOGY, Volume 20, Issue 3,1999, Pages 131-134, doi:10.3760/j.issn:0254-6450.1999.03.001
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CHINESE JOURNAL OF EPIDEMIOLOGY, Volume 20, Issue 3,1999, Pages 191, doi:10.3760/j.issn:0254-6450.1999.03.024
CHINESE JOURNAL OF EPIDEMIOLOGY, Volume 20, Issue 3,1999, Pages 180, doi:10.3760/j.issn:0254-6450.1999.03.020
CHINESE JOURNAL OF EPIDEMIOLOGY, Volume 20, Issue 3,1999, Pages 184-188, doi:10.3760/j.issn:0254-6450.1999.03.016