CHINESE JOURNAL OF EPIDEMIOLOGY, Volume 30, Issue 7,2009, Pages 758-759, doi:10.3760/cma.j.issn.0254-6450.2009.07.033
CHINESE JOURNAL OF EPIDEMIOLOGY, Volume 30, Issue 7,2009, Pages 676-678, doi:10.3760/cma.j.issn.0254-6450.2009.07.007
CHINESE JOURNAL OF EPIDEMIOLOGY, Volume 30, Issue 7,2009, Pages 702-705, doi:10.3760/cma.j.issn.0254-6450.2009.07.014
CHINESE JOURNAL OF EPIDEMIOLOGY, Volume 30, Issue 7,2009, Pages 695-698, doi:10.3760/cma.j.issn.0254-6450.2009.07.012
CHINESE JOURNAL OF EPIDEMIOLOGY, Volume 30, Issue 7,2009, Pages 754-755, doi:10.3760/cma.j.issn.0254-6450.2009.07.030