CHINESE JOURNAL OF EPIDEMIOLOGY, Volume 30, Issue 9,2009, Pages 878-881, doi:10.3760/cma.j.issn.0254-6450.2009.09.002
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CHINESE JOURNAL OF EPIDEMIOLOGY, Volume 30, Issue 9,2009, Pages 960-963, doi:10.3760/cma.j.issn.0254-6450.2009.09.024
CHINESE JOURNAL OF EPIDEMIOLOGY, Volume 30, Issue 9,2009, Pages 977-978, doi:10.3760/cma.j.issn.0254-6450.2009.09.028
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