National Medical Journal of China, Volume 92, Issue 8,2012, Pages 528-531, doi:10.3760/cma.j.issn.0376-2491.2012.08.008
National Medical Journal of China, Volume 92, Issue 8,2012, Pages 524-527, doi:10.3760/cma.j.issn.0376-2491.2012.08.007
National Medical Journal of China, Volume 92, Issue 8,2012, Pages 541-545, doi:10.3760/cma.j.issn.0376-2491.2012.08.011
National Medical Journal of China, Volume 92, Issue 8,2012, Pages 512-515, doi:10.3760/cma.j.issn.0376-2491.2012.08.004
National Medical Journal of China, Volume 92, Issue 8,2012, Pages 559-561, doi:10.3760/cma.j.issn.0376-2491.2012.08.015