CHINESE JOURNAL OF EPIDEMIOLOGY, Volume 26, Issue 7,2005, Pages 543, doi:10.3760/cma.j.issn.0254-6450.2005.07.033
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CHINESE JOURNAL OF EPIDEMIOLOGY, Volume 26, Issue 7,2005, Pages 507-510, doi:10.3760/j.issn:0254-6450.2005.07.010