Chinese Journal of Epidemiology, Volume 33, Issue 5,2012, Pages 464-469, doi:10.3760/cma.j.issn.0254-6450.2012.05.004
Chinese Journal of Epidemiology, Volume 33, Issue 5,2012, Pages 544-545, doi:10.3760/cma.j.issn.0254-6450.2012.05.023
Chinese Journal of Epidemiology, Volume 33, Issue 5,2012, Pages 505-508, doi:10.3760/cma.j.issn.0254-6450.2012.05.013
Chinese Journal of Epidemiology, Volume 33, Issue 5,2012, Pages 455-459, doi:10.3760/cma.j.issn.0254-6450.2012.05.002
Chinese Journal of Epidemiology, Volume 33, Issue 5,2012, Pages 540-543, doi:10.3760/cma.j.issn.0254-6450.2012.05.022