Chinese Journal of Epidemiology, Volume 33, Issue 9,2012, Pages 969-972, doi:10.3760/cma.j.issn.0254-6450.2012.09.021
Chinese Journal of Epidemiology, Volume 33, Issue 9,2012, Pages 993-994, doi:10.3760/cma.j.issn.0254-6450.2012.09.028
Chinese Journal of Epidemiology, Volume 33, Issue 9,2012, Pages 977-982, doi:10.3760/cma.j.issn.0254-6450.2012.09.023
Chinese Journal of Epidemiology, Volume 33, Issue 9,2012, Pages 941-944, doi:10.3760/cma.j.issn.0254-6450.2012.09.015
Chinese Journal of Epidemiology, Volume 33, Issue 9,2012, Pages 956-960, doi:10.3760/cma.j.issn.0254-6450.2012.09.018