CHINESE JOURNAL OF ULTRASONOGRAPHY, Volume 16, Issue 9,2007, Pages 746-750, doi:10.3760/j.issn:1004-4477.2007.09.003
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CHINESE JOURNAL OF ULTRASONOGRAPHY, Volume 16, Issue 9,2007, Pages 764-766, doi:10.3760/j.issn:1004-4477.2007.09.007