CHINESE JOURNAL OF EPIDEMOLOGY, Volume 22, Issue 5,2001, Pages 372-374, doi:10.3760/cma.j.issn.1008-6706.2001.05.053
CHINESE JOURNAL OF EPIDEMIOLOGY, Volume 22, Issue 5,2001, Pages 326-329, doi:10.3760/cma.j.issn.1008-6706.2001.05.053
CHINESE JOURNAL OF EPIDEMOLOGY, Volume 22, Issue 5,2001, Pages 367, doi:10.3760/cma.j.issn.1008-6706.2001.05.053
CHINESE JOURNAL OF EPIDEMIOLOGY, Volume 22, Issue 5,2001, Pages 334-336, doi:10.3760/cma.j.issn.1008-6706.2001.05.053
CHINESE JOURNAL OF EPIDEMIOLOGY, Volume 22, Issue 5,2001, Pages 323-325, doi:10.3760/cma.j.issn.1008-6706.2001.05.053