National Medical Journal of China, Volume 99, Issue 2,2019, Pages 129-134, doi:10.3760/cma.j.issn.0376-2491.2019.02.011
National Medical Journal of China, Volume 99, Issue 2,2019, Pages 105-110, doi:10.3760/cma.j.issn.0376-2491.2019.02.006
National Medical Journal of China, Volume 99, Issue 2,2019, Pages 99-104, doi:10.3760/cma.j.issn.0376-2491.2019.02.005
National Medical Journal of China, Volume 99, Issue 2,2019, Pages 120-123, doi:10.3760/cma.j.issn.0376-2491.2019.02.009
National Medical Journal of China, Volume 99, Issue 2,2019, Pages 148-149, doi:10.3760/cma.j.issn.0376-2491.2019.02.014