CHINESE JOURNAL OF EPIDEMIOLOGY, Volume 28, Issue 5,2007, Pages 499-502, doi:10.3760/j.issn:0254-6450.2007.05.021
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CHINESE JOURNAL OF EPIDEMIOLOGY, Volume 28, Issue 5,2007, Pages 519, doi:10.3760/j.issn:0254-6450.2007.05.031
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CHINESE JOURNAL OF EPIDEMIOLOGY, Volume 28, Issue 5,2007, Pages 473-476, doi:10.3760/j.issn:0254-6450.2007.05.015