CHINESE JOURNAL OF EPIDEMIOLOGY, Volume 31, Issue 7,2010, Pages 759-762, doi:10.3760/cma.j.issn.0254-6450.2010.07.009
CHINESE JOURNAL OF EPIDEMIOLOGY, Volume 31, Issue 7,2010, Pages 831-833, doi:10.3760/cma.j.issn.0254-6450.2010.07.029
CHINESE JOURNAL OF EPIDEMIOLOGY, Volume 31, Issue 7,2010, Pages 751-754, doi:10.3760/cma.j.issn.0254-6450.2010.07.007
CHINESE JOURNAL OF EPIDEMIOLOGY, Volume 31, Issue 7,2010, Pages 727-732, doi:10.3760/cma.j.issn.0254-6450.2010.07.002