Chinese Journal of Epidemiology, Volume 41, Issue 2,2020, Pages 267-272, doi:10.3760/cma.j.issn.0254-6450.2020.02.022
Chinese Journal of Epidemiology, Volume 41, Issue 2,2020, Pages 135-138, doi:10.3760/cma.j.issn.0254-6450.2020.02.001
Chinese Journal of Epidemiology, Volume 41, Issue 2,2020, Pages 178-183, doi:10.3760/cma.j.issn.0254-6450.2020.02.008
Chinese Journal of Epidemiology, Volume 41, Issue 2,2020, Pages 201-206, doi:10.3760/cma.j.issn.0254-6450.2020.02.012
Chinese Journal of Epidemiology, Volume 41, Issue 2,2020, Pages 284-289, doi:10.3760/cma.j.issn.0254-6450.2020.02.025