CHINESE JOURNAL OF EPIDEMIOLOGY, Volume 25, Issue 6,2004, Pages 541-543, doi:10.3760/j.issn:0254-6450.2004.06.021
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CHINESE JOURNAL OF EPIDEMIOLOGY, Volume 25, Issue 6,2004, Pages 514-516, doi:10.3760/j.issn:0254-6450.2004.06.014
CHINESE JOURNAL OF EPIDEMIOLOGY, Volume 25, Issue 6,2004, Pages 547, doi:10.3760/j.issn:0254-6450.2004.06.032