J Am Soc Echocardiogr. 2009 Nov;22(11):1209-11. doi: 10.1016/j.echo.2009.09.018.
Journal of the American Society of Echocardiography : official publication of the American Society of Echocardiography
William F Armstrong
PMID: 19883872 DOI: 10.1016/j.echo.2009.09.018
[No abstract available.]