1 Division of Cardiovascular Medicine, University of Pennsylvania, Philadelphia, Pennsylvania; Department of Medicine, Brigham and Women's Hospital, Boston, Massachusetts.
2 Division of Cardiovascular Medicine, University of Pennsylvania, Philadelphia, Pennsylvania.
3 Department of Radiology, University of Pennsylvania, Philadelphia, Pennsylvania.
4 Division of Cardiovascular Medicine, University of Pennsylvania, Philadelphia, Pennsylvania; Division of Cardiology, University of Washington Medical Center, Seattle, Washington.