CHINESE JOURNAL OF ULTRASONOGRAPHY, Volume 15, Issue 11,2006, Pages 879, doi:10.3760/j.issn:1004-4477.2006.11.031
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CHINESE JOURNAL OF ULTRASONOGRAPHY, Volume 15, Issue 11,2006, Pages 809-812, doi:10.3760/j.issn:1004-4477.2006.11.003