Chinese Journal of Epidemiology, Volume 33, Issue 3,2012, Pages 313-317, doi:10.3760/cma.j.issn.0254-6450.2012.03.015
Chinese Journal of Epidemiology, Volume 33, Issue 3,2012, Pages 323-327, doi:10.3760/cma.j.issn.0254-6450.2012.03.017
Chinese Journal of Epidemiology, Volume 33, Issue 3,2012, Pages 260-264, doi:10.3760/cma.j.issn.0254-6450.2012.03.003
Chinese Journal of Epidemiology, Volume 33, Issue 3,2012, Pages 296-300, doi:10.3760/cma.j.issn.0254-6450.2012.03.011
Chinese Journal of Epidemiology, Volume 33, Issue 3,2012, Pages 269-272, doi:10.3760/cma.j.issn.0254-6450.2012.03.005