CHINESE JOURNAL OF EPIDEMIOLOGY, Volume 28, Issue 6,2007, Pages 554, doi:10.3760/j.issn:0254-6450.2007.06.027
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CHINESE JOURNAL OF EPIDEMIOLOGY, Volume 28, Issue 6,2007, Pages 540-543, doi:10.3760/j.issn:0254-6450.2007.06.006