Department of Medicine; Emory Clinical Cardiovascular Research Institute. Emory Clinical Cardiovascular Research Institute; Division of Cardiology, Emory University, Emory School of Medicine, Atlanta, Ga. Department of Medicine at Northwestern University Feinberg School of Medicine, Chicago, Ill. Division of Cardiology, Emory University, Emory School of Medicine, Atlanta, Ga. Division of Cardiovascular Medicine, UC San Diego School of Medicine, La Jolla, Calif. Emory Clinical Cardiovascular Research Institute; Division of Cardiology, Emory University, Emory School of Medicine, Atlanta, Ga. Electronic address: lsperli@emory.edu.