1. Department of Radiology; University of Washington; Seattle Washington USA
2. Department of Radiology; VA Puget Sound Health Care System; Seattle WA 98108
3. Division of Cardiology, Department of Medicine; University of Washington; Seattle Washington USA
4. Department of Radiology; Brigham and Women's Hospital, Harvard Medical School; Boston Massachusetts USA
5. Division of Cardiothoracic Surgery, Department of Surgery; University of Washington; Seattle Washington USA