CHINESE JORNAL OF ULTRASONOGRAPHY, Volume 10, Issue 8,2001, Pages 505-507, doi:10.3760/j.issn:1004-4477.2001.08.017
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CHINESE JORNAL OF ULTRASONOGRAPHY, Volume 10, Issue 8,2001, Pages 480-482, doi:10.3760/j.issn:1004-4477.2001.08.009
CHINESE JORNAL OF ULTRASONOGRAPHY, Volume 10, Issue 8,2001, Pages 466, doi:10.3760/j.issn:1004-4477.2001.08.026