SHANDONG MEDICAL JOURNAL, Volume 41, Issue 18,2001, Pages 22, doi:10.3969/j.issn.1002-266X.2001.18.025
NATIONAL MEDICAL JOURNAL OF CHINA, Volume 81, Issue 18,2001, Pages 1124-1127, doi:10.3760/j:issn:0376-2491.2001.18.011
SHANDONG MEDICAL JOURNAL, Volume 41, Issue 18,2001, Pages 75, doi:10.3969/j.issn.1002-266X.2001.18.080