CHINESE JOURNAL OF EPIDEMIOLOGY, Volume 22, Issue 6,2001, Pages 455-458, doi:10.3760/j.issn:0254-6450.2001.06.019
CHINESE JOURNAL OF EPIDEMIOLOGY, Volume 22, Issue 6,2001, Pages 421-423, doi:10.3760/j.issn:0254-6450.2001.06.009
CHINESE JOURNAL OF EPIDEMIOLOGY, Volume 22, Issue 6,2001, Pages 467, doi:10.3760/j.issn:0254-6450.2001.06.023
CHINESE JOURNAL OF EPIDEMIOLOGY, Volume 22, Issue 6,2001, Pages 475-476, doi:10.3760/j.issn:0254-6450.2001.06.030
CHINESE JOURNAL OF EPIDEMIOLOGY, Volume 22, Issue 6,2001, Pages 432-434, doi:10.3760/j.issn:0254-6450.2001.06.012