NATIONAL MEDICAL JOURNAL OF CHINA, Volume 88, Issue 44,2008, Pages 3127-3130, doi:10.3321/j.issn:0376-2491.2008.44.009
NATIONAL MEDICAL JOURNAL OF CHINA, Volume 88, Issue 44,2008, Pages 3116-3119, doi:10.3321/j.issn:0376-2491.2008.44.006
NATIONAL MEDICAL JOURNAL OF CHINA, Volume 88, Issue 44,2008, Pages 3112-3115, doi:10.3321/j.issn:0376-2491.2008.44.005