CHINESE JOURNAL OF EPIDEMIOLOGY, Volume 29, Issue 7,2008, Pages 730-733, doi:10.3321/j.issn:0254-6450.2008.07.027
CHINESE JOURNAL OF EPIDEMIOLOGY, Volume 29, Issue 7,2008, Pages 672-675, doi:10.3321/j.issn:0254-6450.2008.07.012
CHINESE JOURNAL OF EPIDEMIOLOGY, Volume 29, Issue 7,2008, Pages 693-695, doi:10.3321/j.issn:0254-6450.2008.07.018
CHINESE JOURNAL OF EPIDEMIOLOGY, Volume 29, Issue 7,2008, Pages 734-736, doi:10.3321/j.issn:0254-6450.2008.07.028
CHINESE JOURNAL OF EPIDEMIOLOGY, Volume 29, Issue 7,2008, Pages 631, doi:10.3321/j.issn:0254-6450.2008.07.002