Chinese Journal of Epidemiology, Volume 32, Issue 11,2011, Pages 1082-1086, doi:10.3760/cma.j.issn.0254-6450.2011.11.006
Chinese Journal of Epidemiology, Volume 32, Issue 11,2011, Pages 1153-1157, doi:10.3760/cma.j.issn.0254-6450.2011.11.022
Chinese Journal of Epidemiology, Volume 32, Issue 11,2011, Pages 1077-1081, doi:10.3760/cma.j.issn.0254-6450.2011.11.005
Chinese Journal of Epidemiology, Volume 32, Issue 11,2011, Pages 1122-1127, doi:10.3760/cma.j.issn.0254-6450.2011.11.015
Chinese Journal of Epidemiology, Volume 32, Issue 11,2011, Pages 1143-1147, doi:10.3760/cma.j.issn.0254-6450.2011.11.020