CHINESE JOURNAL OF EPIDEMIOLOGY, Volume 32, Issue 6,2011, Pages 617-621, doi:10.3760/cma.j.issn.0254-6450.2011.06.019
CHINESE JOURNAL OF EPIDEMIOLOGY, Volume 32, Issue 6,2011, Pages 565-567, doi:10.3760/cma.j.issn.0254-6450.2011.06.007
CHINESE JOURNAL OF EPIDEMIOLOGY, Volume 32, Issue 6,2011, Pages 583-586, doi:10.3760/cma.j.issn.0254-6450.2011.06.012
CHINESE JOURNAL OF EPIDEMIOLOGY, Volume 32, Issue 6,2011, Pages 539-546, doi:10.3760/cma.j.issn.0254-6450.2011.06.002
CHINESE JOURNAL OF EPIDEMIOLOGY, Volume 32, Issue 6,2011, Pages 593-597, doi:10.3760/cma.j.issn.0254-6450.2011.06.014