1. Johns Hopkins University, MR 110 Radiology, Nelson Basement, 600 N Wolfe Street, Baltimore, MD, USA
2. Cardiology, Johns Hopkins Hospital, Blalock 524, 600 N Wolfe Street, Baltimore, MD, USA
3. Office of Biostatistics Research, 2 Rockledge Center, Room 9212, 6701 Rockledge Drive, Bethesda, MD, USA
4. Cardiology, Johns Hopkins Hospital, Halsted 566, 600 N Wolfe St, Baltimore, MD, USA
5. Wake Forest University Health Sciences, Department of Internal Medicine/Cardiology, Medical Center Blvd., Winston-Salem, NC, USA
6. University of Wisconsin School of Medicine and Public Health, Department of Radiology, 600 Highland Avenue, Madison, WI, USA