Chinese Journal of Epidemiology, Volume 34, Issue 6,2013, Pages 560-565, doi:10.3760/cma.j.issn.0254-6450.2013.06.005
Chinese Journal of Epidemiology, Volume 34, Issue 6,2013, Pages 573-577, doi:10.3760/cma.j.issn.0254-6450.2013.06.008
Chinese Journal of Epidemiology, Volume 34, Issue 6,2013, Pages 598-600, doi:10.3760/cma.j.issn.0254-6450.2013.06.014
Chinese Journal of Epidemiology, Volume 34, Issue 6,2013, Pages 618-621, doi:10.3760/cma.j.issn.0254-6450.2013.06.019
Chinese Journal of Epidemiology, Volume 34, Issue 6,2013, Pages 589-593, doi:10.3760/cma.j.issn.0254-6450.2013.06.012