CHINESE JOURNAL OF EPIDEMIOLOGY, Volume 32, Issue 3,2011, Pages 235-238, doi:10.3760/cma.j.issn.0254-6450.2011.03.007
CHINESE JOURNAL OF EPIDEMIOLOGY, Volume 32, Issue 3,2011, Pages 285-289, doi:10.3760/cma.j.issn.0254-6450.2011.03.019
CHINESE JOURNAL OF EPIDEMIOLOGY, Volume 32, Issue 3,2011, Pages 256-259, doi:10.3760/cma.j.issn.0254-6450.2011.03.012
CHINESE JOURNAL OF EPIDEMIOLOGY, Volume 32, Issue 3,2011, Pages 209-220, doi:10.3760/cma.j.issn.0254-6450.2011.03.001