1. The University of Texas Health Science Center at San Antonio, Division of Cardiology, Department of Medicine, 7703 Floyd Curl Drive, San Antonio, Texas 78229, United StatesbSouth Texas Veterans Health Care System, The Department of Veterans Affairs, San A
2. The University of Texas at Austin, Department of Biomedical Engineering, 1 University Station C0800, Austin, Texas 78712, United States
3. The University of Texas Health Science Center at San Antonio, Division of Cardiology, Department of Medicine, 7703 Floyd Curl Drive, San Antonio, Texas 78229, United States
4. Leiden University Medical Center, Division of Image Processing, Department of Radiology, Albinusdreef 2, 2333 ZA Leiden, The Netherlands