National Medical Journal of China, Volume 93, Issue 7,2013, Pages 512-515, doi:10.3760/cma.j.issn.0376-2491.2013.07.009
National Medical Journal of China, Volume 93, Issue 7,2013, Pages 508-511, doi:10.3760/cma.j.issn.0376-2491.2013.07.008
National Medical Journal of China, Volume 93, Issue 7,2013, Pages 483-486, doi:10.3760/cma.j.issn.0376-2491.2013.07.002
National Medical Journal of China, Volume 93, Issue 7,2013, Pages 537-540, doi:10.3760/cma.j.issn.0376-2491.2013.07.016
National Medical Journal of China, Volume 93, Issue 7,2013, Pages 491-495, doi:10.3760/cma.j.issn.0376-2491.2013.07.004