Use of ultrasound enhancing agents in transesophageal echocardiography to improve interpretive confidence of left atrial appendage thrombus. - Doukky, Rami; Donenberg, Merrick J.; Parker, Jeremy; Kaplan, Jonathan; Travers, Chad; Soble, Jeffrey S.; Sattar, Payman; Krishnan, Kousik; Madias, Christopher; Tracy, Melissa; Feinstein, Steven B. (Echocardiography, 2019)