CHINESE JOURNAL OF EPIDEMIOLOGY, Volume 30, Issue 2,2009, Pages 184-188, doi:10.3760/cma.j.issn.0254-6450.2009.02.021
CHINESE JOURNAL OF EPIDEMIOLOGY, Volume 30, Issue 2,2009, Pages 196-198, doi:10.3760/cma.j.issn.0254-6450.2009.02.024
CHINESE JOURNAL OF EPIDEMIOLOGY, Volume 30, Issue 2,2009, Pages 147-150, doi:10.3760/cma.j.issn.0254-6450.2009.02.012
CHINESE JOURNAL OF EPIDEMIOLOGY, Volume 30, Issue 2,2009, Pages 131-135, doi:10.3760/cma.j.issn.0254-6450.2009.02.007
CHINESE JOURNAL OF EPIDEMIOLOGY, Volume 30, Issue 2,2009, Pages 144-146, doi:10.3760/cma.j.issn.0254-6450.2009.02.011