Chinese Journal of Epidemiology, Volume 33, Issue 7,2012, Pages 717-721, doi:10.3760/cma.j.issn.0254-6450.2012.07.016
Chinese Journal of Epidemiology, Volume 33, Issue 7,2012, Pages 722-725, doi:10.3760/cma.j.issn.0254-6450.2012.07.017
Chinese Journal of Epidemiology, Volume 33, Issue 7,2012, Pages 698-701, doi:10.3760/cma.j.issn.0254-6450.2012.07.012
Chinese Journal of Epidemiology, Volume 33, Issue 7,2012, Pages 702-705, doi:10.3760/cma.j.issn.0254-6450.2012.07.013
Chinese Journal of Epidemiology, Volume 33, Issue 7,2012, Pages 658-662, doi:10.3760/cma.j.issn.0254-6450.2012.07.004