National Medical Journal of China, Volume 99, Issue 17,2019, Pages 1349-1352, doi:10.3760/cma.j.issn.0376-2491.2019.17.018
National Medical Journal of China, Volume 99, Issue 17,2019, Pages 1358-1360, doi:10.3760/cma.j.issn.0376-2491.2019.17.020
National Medical Journal of China, Volume 99, Issue 17,2019, Pages 1302-1306, doi:10.3760/cma.j.issn.0376-2491.2019.17.006
National Medical Journal of China, Volume 99, Issue 17,2019, Pages 1281-1285, doi:10.3760/cma.j.issn.0376-2491.2019.17.001