National Medical Journal of China, Volume 99, Issue 26,2019, Pages 2001-2003, doi:10.3760/cma.j.issn.0376-2491.2019.26.001
National Medical Journal of China, Volume 99, Issue 26,2019, Pages 2014-2023, doi:10.3760/cma.j.issn.0376-2491.2019.26.005
National Medical Journal of China, Volume 99, Issue 26,2019, Pages 2007-2010, doi:10.3760/cma.j.issn.0376-2491.2019.26.003
National Medical Journal of China, Volume 99, Issue 26,2019, Pages 2004-2006, doi:10.3760/cma.j.issn.0376-2491.2019.26.002
National Medical Journal of China, Volume 99, Issue 26,2019, Pages 2011-2013, doi:10.3760/cma.j.issn.0376-2491.2019.26.004