National Medical Journal of China, Volume 91, Issue 38,2011, Pages 2692-2696, doi:10.3760/cma.j.issn.0376-2491.2011.38.010
National Medical Journal of China, Volume 91, Issue 38,2011, Pages 2678-2682, doi:10.3760/cma.j.issn.0376-2491.2011.38.005
National Medical Journal of China, Volume 91, Issue 38,2011, Pages 2701, doi:10.3760/cma.j.issn.0376-2491.2011.38.012
National Medical Journal of China, Volume 91, Issue 38,2011, Pages 2706-2709, doi:10.3760/cma.j.issn.0376-2491.2011.38.014
National Medical Journal of China, Volume 91, Issue 38,2011, Pages 2710-2713, doi:10.3760/cma.j.issn.0376-2491.2011.38.015