CHINESE JOURNAL OF EPIDEMIOLOGY, Volume 30, Issue 4,2009, Pages 331-334, doi:10.3760/cma.j.issn.0254-6450.2009.04.006
CHINESE JOURNAL OF EPIDEMIOLOGY, Volume 30, Issue 4,2009, Pages 393-397, doi:10.3760/cma.j.issn.0254-6450.2009.04.021
CHINESE JOURNAL OF EPIDEMIOLOGY, Volume 30, Issue 4,2009, Pages 348-351, doi:10.3760/cma.j.issn.0254-6450.2009.04.010
CHINESE JOURNAL OF EPIDEMIOLOGY, Volume 30, Issue 4,2009, Pages 416-418, doi:10.3760/cma.j.issn.0254-6450.2009.04.028
CHINESE JOURNAL OF EPIDEMIOLOGY, Volume 30, Issue 4,2009, Pages 313-317, doi:10.3760/cma.j.issn.0254-6450.2009.04.001