CHINESE JOURNAL OF ULTRASONOGRAPHY, Volume 14, Issue 7,2005, Pages 559-560, doi:10.3760/j.issn:1004-4477.2005.07.024
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CHINESE JOURNAL OF ULTRASONOGRAPHY, Volume 14, Issue 7,2005, Pages 512-516, doi:10.3760/j.issn:1004-4477.2005.07.008