National Medical Journal of China, Volume 100, Issue 7,2020, Pages 509-512, doi:10.3760/cma.j.issn.0376-2491.2020.07.006
National Medical Journal of China, Volume 100, Issue 7,2020, Pages 538-540, doi:10.3760/cma.j.issn.0376-2491.2020.07.012
National Medical Journal of China, Volume 100, Issue 7,2020, Pages 556-560, doi:10.3760/cma.j.issn.0376-2491.2020.07.017
National Medical Journal of China, Volume 100, Issue 7,2020, Pages 481-483, doi:10.3760/cma.j.issn.0376-2491.2020.07.001
National Medical Journal of China, Volume 100, Issue 7,2020, Pages 533-537, doi:10.3760/cma.j.issn.0376-2491.2020.07.011