CHINESE JOURNAL OF ULTRASONOGRAPHY, Volume 7, Issue 3,1998, Pages 168,
CHINESE JOURNAL OF ULTRASONOGRAPHY, Volume 7, Issue 3,1998, Pages 插1,
CHINESE JOURNAL OF ULTRASONOGRAPHY, Volume 7, Issue 3,1998, Pages 192,
CHINESE JOURNAL OF ULTRASONOGRAPHY, Volume 7, Issue 3,1998, Pages 插3,