National Medical Journal of China, Volume 99, Issue 24,2019, Pages 1881-1886, doi:10.3760/cma.j.issn.0376-2491.2019.24.009
National Medical Journal of China, Volume 99, Issue 24,2019, Pages 1904-1910, doi:10.3760/cma.j.issn.0376-2491.2019.24.013
National Medical Journal of China, Volume 99, Issue 24,2019, Pages 1864-1869, doi:10.3760/cma.j.issn.0376-2491.2019.24.006
National Medical Journal of China, Volume 99, Issue 24,2019, Pages 1898-1903, doi:10.3760/cma.j.issn.0376-2491.2019.24.012
National Medical Journal of China, Volume 99, Issue 24,2019, Pages 1848-1852, doi:10.3760/cma.j.issn.0376-2491.2019.24.003