Bisinov Elizabeth A, Dieter Robert S, Ballantyne Ford, Wolff Matthew R, Stein James H
Cardiovascular Medicine, University of Wisconsin Medical School, Madison 53792, USA.
J Am Soc Echocardiogr. 2003 Aug;16(8):897-8. doi: 10.1067/S0894-7317(03)00415-2.