National Medical Journal of China, Volume 91, Issue 40,2011, Pages 2863-2867, doi:10.3760/cma.j.issn.0376-2491.2011.40.017
National Medical Journal of China, Volume 91, Issue 40,2011, Pages 2841-2844, doi:10.3760/cma.j.issn.0376-2491.2011.40.010
National Medical Journal of China, Volume 91, Issue 40,2011, Pages 2824-2827, doi:10.3760/cma.j.issn.0376-2491.2011.40.005
National Medical Journal of China, Volume 91, Issue 40,2011, Pages 2828-2831, doi:10.3760/cma.j.issn.0376-2491.2011.40.006
National Medical Journal of China, Volume 91, Issue 40,2011, Pages 2868-2872, doi:10.3760/cma.j.issn.0376-2491.2011.40.018