Chinese Journal of Epidemiology, Volume 33, Issue 2,2012, Pages 177-180, doi:10.3760/cma.j.issn.0254-6450.2012.02.011
Chinese Journal of Epidemiology, Volume 33, Issue 2,2012, Pages 150-153, doi:10.3760/cma.j.issn.0254-6450.2012.02.005
Chinese Journal of Epidemiology, Volume 33, Issue 2,2012, Pages 239-241, doi:10.3760/cma.j.issn.0254-6450.2012.02.025
Chinese Journal of Epidemiology, Volume 33, Issue 2,2012, Pages 189-191, doi:10.3760/cma.j.issn.0254-6450.2012.02.014
Chinese Journal of Epidemiology, Volume 33, Issue 2,2012, Pages 185-188, doi:10.3760/cma.j.issn.0254-6450.2012.02.013