CHINESE JOURNAL OF ULTRASONOGRAPHY, Volume 15, Issue 7,2006, Pages 481-484, doi:10.3760/j.issn:1004-4477.2006.07.001
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CHINESE JOURNAL OF ULTRASONOGRAPHY, Volume 15, Issue 7,2006, Pages 539-540, doi:10.3760/j.issn:1004-4477.2006.07.018
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