National Medical Journal of China, Volume 99, Issue 7,2019, Pages 557-560, doi:10.3760/cma.j.issn.0376-2491.2019.07.018
National Medical Journal of China, Volume 99, Issue 7,2019, Pages 525-531, doi:10.3760/cma.j.issn.0376-2491.2019.07.010
National Medical Journal of China, Volume 99, Issue 7,2019, Pages 484-490, doi:10.3760/cma.j.issn.0376-2491.2019.07.002
National Medical Journal of China, Volume 99, Issue 7,2019, Pages 532-536, doi:10.3760/cma.j.issn.0376-2491.2019.07.011
National Medical Journal of China, Volume 99, Issue 7,2019, Pages 553-556, doi:10.3760/cma.j.issn.0376-2491.2019.07.017