CHINESE JOURNAL OF ULTRASONOGRAPHY, Volume 7, Issue 6,1998, Pages 342,
CHINESE JOURNAL OF ULTRASONOGRAPHY, Volume 7, Issue 6,1998, Pages 339, doi:10.3760/cma.j.issn.1004-4477.1998.06.107
CHINESE JOURNAL OF ULTRASONOGRAPHY, Volume 7, Issue 6,1998, Pages 376,
CHINESE JOURNAL OF ULTRASONOGRAPHY, Volume 7, Issue 6,1998, Pages 374,
CHINESE JOURNAL OF ULTRASONOGRAPHY, Volume 7, Issue 6,1998, Pages 356,378,