CHINESE JOURNAL OF EPIDEMIOLOGY, Volume 21, Issue 6,2000, Pages 434-436, doi:10.3760/j.issn:0254-6450.2000.06.010
CHINESE JOURNAL OF EPIDEMIOLOGY, Volume 21, Issue 6,2000, Pages 407-409, doi:10.3760/j.issn:0254-6450.2000.06.002
CHINESE JOURNAL OF EPIDEMIOLOGY, Volume 21, Issue 6,2000, Pages 444, doi:10.3760/j.issn:0254-6450.2000.06.020
CHINESE JOURNAL OF EPIDEMIOLOGY, Volume 21, Issue 6,2000, Pages 405-406, doi:10.3760/j.issn:0254-6450.2000.06.001
CHINESE JOURNAL OF EPIDEMIOLOGY, Volume 21, Issue 6,2000, Pages 470-471, doi:10.3760/j.issn:0254-6450.2000.06.028