National Medical Journal of China, Volume 92, Issue 21,2012, Pages 1502-1504, doi:10.3760/cma.j.issn.0376-2491.2012.21.016
National Medical Journal of China, Volume 92, Issue 21,2012, Pages 1508-1510, doi:10.3760/cma.j.issn.0376-2491.2012.21.018
National Medical Journal of China, Volume 92, Issue 21,2012, Pages 1481-1485, doi:10.3760/cma.j.issn.0376-2491.2012.21.010
National Medical Journal of China, Volume 92, Issue 21,2012, Pages 1511-1512, doi:10.3760/cma.j.issn.0376-2491.2012.21.019
National Medical Journal of China, Volume 92, Issue 21,2012, Pages 1495-1497, doi:10.3760/cma.j.issn.0376-2491.2012.21.014