National Medical Journal of China, Volume 92, Issue 16,2012, Pages 1084-1086, doi:10.3760/cma.j.issn.0376-2491.2012.16.002
National Medical Journal of China, Volume 92, Issue 16,2012, Pages 1107-1111, doi:10.3760/cma.j.issn.0376-2491.2012.16.008
National Medical Journal of China, Volume 92, Issue 16,2012, Pages 1145-1147, doi:10.3760/cma.j.issn.0376-2491.2012.16.019
National Medical Journal of China, Volume 92, Issue 16,2012, Pages 1138-1142, doi:10.3760/cma.j.issn.0376-2491.2012.16.017
National Medical Journal of China, Volume 92, Issue 16,2012, Pages 1087-1090, doi:10.3760/cma.j.issn.0376-2491.2012.16.003