National Medical Journal of China, Volume 99, Issue 6,2019, Pages 474-477, doi:10.3760/cma.j.issn.0376-2491.2019.06.020
National Medical Journal of China, Volume 99, Issue 6,2019, Pages 414-415, doi:10.3760/cma.j.issn.0376-2491.2019.06.005
National Medical Journal of China, Volume 99, Issue 6,2019, Pages 428-431, doi:10.3760/cma.j.issn.0376-2491.2019.06.009
National Medical Journal of China, Volume 99, Issue 6,2019, Pages 423-427, doi:10.3760/cma.j.issn.0376-2491.2019.06.008
National Medical Journal of China, Volume 99, Issue 6,2019, Pages 462-465, doi:10.3760/cma.j.issn.0376-2491.2019.06.016