National Medical Journal of China, Volume 100, Issue 2,2020, Pages 150-153, doi:10.3760/cma.j.issn.0376-2491.2020.02.014
National Medical Journal of China, Volume 100, Issue 2,2020, Pages 141-145, doi:10.3760/cma.j.issn.0376-2491.2020.02.012
National Medical Journal of China, Volume 100, Issue 2,2020, Pages 130-135, doi:10.3760/cma.j.issn.0376-2491.2020.02.010
National Medical Journal of China, Volume 100, Issue 2,2020, Pages 125-129, doi:10.3760/cma.j.issn.0376-2491.2020.02.009
National Medical Journal of China, Volume 100, Issue 2,2020, Pages 85-88, doi:10.3760/cma.j.issn.0376-2491.2020.02.002