Chinese Journal of Epidemiology, Volume 40, Issue 4,2019, Pages 446-450, doi:10.3760/cma.j.issn.0254-6450.2019.04.014
Chinese Journal of Epidemiology, Volume 40, Issue 4,2019, Pages 394-399, doi:10.3760/cma.j.issn.0254-6450.2019.04.005
Chinese Journal of Epidemiology, Volume 40, Issue 4,2019, Pages 440-445, doi:10.3760/cma.j.issn.0254-6450.2019.04.013
Chinese Journal of Epidemiology, Volume 40, Issue 4,2019, Pages 433-439, doi:10.3760/cma.j.issn.0254-6450.2019.04.012