Chinese Journal of Epidemiology, Volume 34, Issue 8,2013, Pages 808-811, doi:10.3760/cma.j.issn.0254-6450.2013.08.013
Chinese Journal of Epidemiology, Volume 34, Issue 8,2013, Pages 832-835, doi:10.3760/cma.j.issn.0254-6450.2013.08.018
Chinese Journal of Epidemiology, Volume 34, Issue 8,2013, Pages 796-799, doi:10.3760/cma.j.issn.0254-6450.2013.08.010
Chinese Journal of Epidemiology, Volume 34, Issue 8,2013, Pages 844-848, doi:10.3760/cma.j.issn.0254-6450.2013.08.021
Chinese Journal of Epidemiology, Volume 34, Issue 8,2013, Pages 788-791, doi:10.3760/cma.j.issn.0254-6450.2013.08.008