1. Stanford Cardiovascular Institute, Stanford University School of Medicine, Stanford, California2Division of Cardiovascular Medicine, Department of Medicine, Stanford University School of Medicine, Stanford, California3Veterans Affairs Palo Alto Health Care System, Palo Alto, California
2. Stanford Cardiovascular Institute, Stanford University School of Medicine, Stanford, California2Division of Cardiovascular Medicine, Department of Medicine, Stanford University School of Medicine, Stanford, California
3. Stanford Cardiovascular Institute, Stanford University School of Medicine, Stanford, California2Division of Cardiovascular Medicine, Department of Medicine, Stanford University School of Medicine, Stanford, California4Department of Radiology, Stanford University School of Medicine, Stanford, California