CHINESE JOURNAL OF EPIDEMIOLOGY, Volume 27, Issue 4,2006, Pages 307-310, doi:10.3760/j.issn:0254-6450.2006.04.007
CHINESE JOURNAL OF EPIDEMIOLOGY, Volume 27, Issue 4,2006, Pages 324-327, doi:10.3760/j.issn:0254-6450.2006.04.011
CHINESE JOURNAL OF EPIDEMIOLOGY, Volume 27, Issue 4,2006, Pages 351-355, doi:10.3760/j.issn:0254-6450.2006.04.017
CHINESE JOURNAL OF EPIDEMIOLOGY, Volume 27, Issue 4,2006, Pages 288-292, doi:10.3760/j.issn:0254-6450.2006.04.003