. Author manuscript; available in PMC: 2015 Jul 1.
Published in final edited form as: J Am Soc Echocardiogr. 2014 Apr 26;27(7):786–793.e2. doi: 10.1016/j.echo.2014.03.013
© 2014 American Society of Echocardiography. Published by Mosby, Inc. All rights reserved.