CHINESE JOURNAL OF ULTRASONOGRAPHY, Volume 16, Issue 1,2007, Pages 90, doi:10.3760/j.issn:1004-4477.2007.01.037
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CHINESE JOURNAL OF ULTRASONOGRAPHY, Volume 16, Issue 1,2007, Pages 20-22, doi:10.3760/j.issn:1004-4477.2007.01.006