National Medical Journal of China, Volume 99, Issue 3,2019, Pages 174-177, doi:10.3760/cma.j.issn.0376-2491.2019.03.004
National Medical Journal of China, Volume 99, Issue 3,2019, Pages 223-226, doi:10.3760/cma.j.issn.0376-2491.2019.03.014
National Medical Journal of China, Volume 99, Issue 3,2019, Pages 193-197, doi:10.3760/cma.j.issn.0376-2491.2019.03.008
National Medical Journal of China, Volume 99, Issue 3,2019, Pages 164-168, doi:10.3760/cma.j.issn.0376-2491.2019.03.002