National Medical Journal of China, Volume 92, Issue 12,2012, Pages 841, doi:10.3760/cma.j.issn.0376-2491.2012.12.015
National Medical Journal of China, Volume 92, Issue 12,2012, Pages 831-834, doi:10.3760/cma.j.issn.0376-2491.2012.12.012
National Medical Journal of China, Volume 92, Issue 12,2012, Pages 822-826, doi:10.3760/cma.j.issn.0376-2491.2012.12.009
National Medical Journal of China, Volume 92, Issue 12,2012, Pages 830, doi:10.3760/cma.j.issn.0376-2491.2012.12.011