Mor-Avi V, Jacobs LD, Weiss RJ, Sugeng L, Weinert L, Bouchard T, Spencer KT, Lang RM. Color encoding of endocardial motion improves the interpretation of contrast-enhanced echocardiographic stress tests by less-experienced readers. J Am Soc Echocardiogr. 2006 Jan; 19(1):48-54.