Response to Bai
Journal of the American Society of Echocardiography : official publication of the American Society of Echocardiography (2009) - Comment
doi: 10.1016/j.echo.2009.05.022  issn: 0894-7317 

Sherif F. Nagueh, Christopher P. Appleton, Thierry C. Gillebert, Paolo N. Marino, Jae K. Oh, Otto A. Smiseth, Alan D. Waggoner, Frank A. Flachskampf