National Medical Journal of China, Volume 92, Issue 28,2012, Pages 1988-1991, doi:10.3760/cma.j.issn.0376-2491.2012.28.014
National Medical Journal of China, Volume 92, Issue 28,2012, Pages 1978-1980, doi:10.3760/cma.j.issn.0376-2491.2012.28.010
National Medical Journal of China, Volume 92, Issue 28,2012, Pages 1992-1996, doi:10.3760/cma.j.issn.0376-2491.2012.28.015
National Medical Journal of China, Volume 92, Issue 28,2012, Pages 2005-2007, doi:10.3760/cma.j.issn.0376-2491.2012.28.019
National Medical Journal of China, Volume 92, Issue 28,2012, Pages 2002-2004, doi:10.3760/cma.j.issn.0376-2491.2012.28.018