National Medical Journal of China, Volume 92, Issue 15,2012, Pages 1041-1044, doi:10.3760/cma.j.issn.0376-2491.2012.15.008
National Medical Journal of China, Volume 92, Issue 15,2012, Pages 1070-1073, doi:10.3760/cma.j.issn.0376-2491.2012.15.016
National Medical Journal of China, Volume 92, Issue 15,2012, Pages 1033-1036, doi:10.3760/cma.j.issn.0376-2491.2012.15.006
National Medical Journal of China, Volume 92, Issue 15,2012, Pages 1045-1048, doi:10.3760/cma.j.issn.0376-2491.2012.15.009
National Medical Journal of China, Volume 92, Issue 15,2012, Pages 1012-1016, doi:10.3760/cma.j.issn.0376-2491.2012.15.002