CHINESE JOURNAL OF ULTRASONOGRAPHY, Volume 9, Issue 1,2000, Pages 20,26,36,41,43,46,
CHINESE JOURNAL OF ULTRASONOGRAPHY, Volume 9, Issue 1,2000, Pages 41, doi:10.3760/j.issn:1004-4477.2000.01.038
CHINESE JOURNAL OF ULTRASONOGRAPHY, Volume 9, Issue 1,2000, Pages 63, doi:10.3760/j.issn:1004-4477.2000.01.043