Chinese Journal of Epidemiology, Volume 33, Issue 4,2012, Pages 413-417, doi:10.3760/cma.j.issn.0254-6450.2012.04.015
Chinese Journal of Epidemiology, Volume 33, Issue 4,2012, Pages 368-373, doi:10.3760/cma.j.issn.0254-6450.2012.04.005
Chinese Journal of Epidemiology, Volume 33, Issue 4,2012, Pages 435-438, doi:10.3760/cma.j.issn.0254-6450.2012.04.020
Chinese Journal of Epidemiology, Volume 33, Issue 4,2012, Pages 442-443, doi:10.3760/cma.j.issn.0254-6450.2012.04.022
Chinese Journal of Epidemiology, Volume 33, Issue 4,2012, Pages 447-448, doi:10.3760/cma.j.issn.0254-6450.2012.04.025