1 Cardiology Division, Massachusetts General Hospital and Harvard Medical School, Boston, Massachusetts; Cardiovascular Imaging Research Center, Massachusetts General Hospital and Harvard Medical School, Boston, Massachusetts. Electronic address: atawakol@mgh.harvard.edu.
2 Cardiology Division, Massachusetts General Hospital and Harvard Medical School, Boston, Massachusetts; Cardiovascular Imaging Research Center, Massachusetts General Hospital and Harvard Medical School, Boston, Massachusetts.
3 Cardiovascular Imaging Research Center, Massachusetts General Hospital and Harvard Medical School, Boston, Massachusetts.