National Medical Journal of China, Volume 98, Issue 8,2018, Pages 612-616, doi:10.3760/cma.j.issn.0376-2491.2018.08.012
National Medical Journal of China, Volume 98, Issue 8,2018, Pages 587-591, doi:10.3760/cma.j.issn.0376-2491.2018.08.006
National Medical Journal of China, Volume 98, Issue 8,2018, Pages 576-580, doi:10.3760/cma.j.issn.0376-2491.2018.08.004
National Medical Journal of China, Volume 98, Issue 8,2018, Pages 592-595, doi:10.3760/cma.j.issn.0376-2491.2018.08.008