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Journal of Echocardiography > 2011 > 9 > 1 > 9-16
Journal of the American Society of Echocardiography > 2008 > 21 > 6 > 675-683
Journal of Echocardiography > 2011 > 9 > 1 > 9-16
Journal of the American Society of Echocardiography > 2008 > 21 > 6 > 675-683