National Medical Journal of China, Volume 92, Issue 10,2012, Pages 705-708, doi:10.3760/cma.j.issn.0376-2491.2012.10.018
National Medical Journal of China, Volume 92, Issue 10,2012, Pages 695-699, doi:10.3760/cma.j.issn.0376-2491.2012.10.016
National Medical Journal of China, Volume 92, Issue 10,2012, Pages 685-688, doi:10.3760/cma.j.issn.0376-2491.2012.10.013
National Medical Journal of China, Volume 92, Issue 10,2012, Pages 668-671, doi:10.3760/cma.j.issn.0376-2491.2012.10.009
National Medical Journal of China, Volume 92, Issue 10,2012, Pages 657-658, doi:10.3760/cma.j.issn.0376-2491.2012.10.004