NATIONAL MEDICAL JOURNAL OF CHINA, Volume 91, Issue 7,2011, Pages 441-444, doi:10.3760/cma.j.issn.0376-2491.2011.07.004
NATIONAL MEDICAL JOURNAL OF CHINA, Volume 91, Issue 7,2011, Pages 445-450, doi:10.3760/cma.j.issn.0376-2491.2011.07.005
NATIONAL MEDICAL JOURNAL OF CHINA, Volume 91, Issue 7,2011, Pages 491-495, doi:10.3760/cma.j.issn.0376-2491.2011.07.016
NATIONAL MEDICAL JOURNAL OF CHINA, Volume 91, Issue 7,2011, Pages 464-468, doi:10.3760/cma.j.issn.0376-2491.2011.07.010