Keeley E C, Lange R A, Landau C, Willard J E, Hillis L D
Department of Internal Medicine (Cardiovascular Division), University of Texas Southwestern Medical Center, Dallas 75235-9047, USA.
Am J Cardiol. 1995 May 1;75(14):939-40. doi: 10.1016/s0002-9149(99)80692-4.