CHINESE JOURNAL OF EPIDEMIOLOGY, Volume 27, Issue 7,2006, Pages 555-559, doi:10.3760/j.issn:0254-6450.2006.07.002
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CHINESE JOURNAL OF EPIDEMIOLOGY, Volume 27, Issue 7,2006, Pages 630-633, doi:10.3760/j.issn:0254-6450.2006.07.020
CHINESE JOURNAL OF EPIDEMIOLOGY, Volume 27, Issue 7,2006, Pages 642-643, doi:10.3760/j.issn:0254-6450.2006.07.028
CHINESE JOURNAL OF EPIDEMIOLOGY, Volume 27, Issue 7,2006, Pages 617, doi:10.3760/j.issn:0254-6450.2006.07.026