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CHINESE JOURNAL OF ULTRASONOGRAPHY, Volume 15, Issue 8,2006, Pages 594-596, doi:10.3760/j.issn:1004-4477.2006.08.010
CHINESE JOURNAL OF ULTRASONOGRAPHY, Volume 15, Issue 8,2006, Pages 568-572, doi:10.3760/j.issn:1004-4477.2006.08.003