National Medical Journal of China, Volume 93, Issue 9,2013, Pages 676-680, doi:10.3760/cma.j.issn.0376-2491.2013.09.010
National Medical Journal of China, Volume 93, Issue 9,2013, Pages 705-708, doi:10.3760/cma.j.issn.0376-2491.2013.09.018
National Medical Journal of China, Volume 93, Issue 9,2013, Pages 641-643, doi:10.3760/cma.j.issn.0376-2491.2013.09.001
National Medical Journal of China, Volume 93, Issue 9,2013, Pages 656-658, doi:10.3760/cma.j.issn.0376-2491.2013.09.005