Chinese Journal of Epidemiology, Volume 32, Issue 9,2011, Pages 859-863, doi:10.3760/cma.j.issn.0254-6450.2011.09.003
Chinese Journal of Epidemiology, Volume 32, Issue 9,2011, Pages 882-887, doi:10.3760/cma.j.issn.0254-6450.2011.09.008
Chinese Journal of Epidemiology, Volume 32, Issue 9,2011, Pages 854-858, doi:10.3760/cma.j.issn.0254-6450.2011.09.002
Chinese Journal of Epidemiology, Volume 32, Issue 9,2011, Pages 864-868, doi:10.3760/cma.j.issn.0254-6450.2011.09.004
Chinese Journal of Epidemiology, Volume 32, Issue 9,2011, Pages 949-950, doi:10.3760/cma.j.issn.0254-6450.2011.09.024