CHINESE JOURNAL OF ULTRASONOGRAPHY, Volume 12, Issue 1,2003, Pages 52-53, doi:10.3760/j.issn:1004-4477.2003.01.017
CHINESE JOURNAL OF ULTRASONOGRAPHY, Volume 12, Issue 1,2003, Pages 53-54, doi:10.3760/j.issn:1004-4477.2003.01.027
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CHINESE JOURNAL OF ULTRASONOGRAPHY, Volume 12, Issue 1,2003, Pages 47-48, doi:10.3760/j.issn:1004-4477.2003.01.014