National Medical Journal of China, Volume 92, Issue 33,2012, Pages 2357-2361, doi:10.3760/cma.j.issn.0376-2491.2012.33.015
National Medical Journal of China, Volume 92, Issue 33,2012, Pages 2339-2344, doi:10.3760/cma.j.issn.0376-2491.2012.33.010
National Medical Journal of China, Volume 92, Issue 33,2012, Pages 2331-2334, doi:10.3760/cma.j.issn.0376-2491.2012.33.008
National Medical Journal of China, Volume 92, Issue 33,2012, Pages 2353-2356, doi:10.3760/cma.j.issn.0376-2491.2012.33.014
National Medical Journal of China, Volume 92, Issue 33,2012, Pages 2372-2374, doi:10.3760/cma.j.issn.0376-2491.2012.33.019