National Medical Journal of China, Volume 92, Issue 3,2012, Pages 179-183, doi:10.3760/cma.j.issn.0376-2491.2012.03.009
National Medical Journal of China, Volume 92, Issue 3,2012, Pages 188-191, doi:10.3760/cma.j.issn.0376-2491.2012.03.011
National Medical Journal of China, Volume 92, Issue 3,2012, Pages 152-155, doi:10.3760/cma.j.issn.0376-2491.2012.03.003
National Medical Journal of China, Volume 92, Issue 3,2012, Pages 200-202, doi:10.3760/cma.j.issn.0376-2491.2012.03.014
National Medical Journal of China, Volume 92, Issue 3,2012, Pages 175-178, doi:10.3760/cma.j.issn.0376-2491.2012.03.008