Affiliation: | a Referral Center for Myocardial Diseases, Azienda Ospedaliera Universitaria Careggi, Florence, Italy b Hypertrophic Cardiomyopathy Center, Minneapolis, Heart Institute Foundation, Minneapolis, Minnesota c Department of Medicine, Cardiovascular Division, Beth Israel Deaconess Hospital and Harvard Medical School, Boston, Massachusetts d PERFUSE Core and Angiographic Laboratory and Data Coordinating Center, Harvard Medical School, Boston, Massachusetts e Division of Cardiology, Tufts Medical Center, Boston, Massachusetts f National Heart, Lung and Blood Institute of the Framingham Heart Center, Framingham, Massachusetts |