1 Division of Cardiology, Department of Medicine, Bluhm Cardiovascular Institute, Northwestern University Feinberg School of Medicine, Chicago, IL, USA. quentin-youmans@northwestern.edu.
2 Division of Cardiology, Department of Medicine, Bluhm Cardiovascular Institute, Northwestern University Feinberg School of Medicine, Chicago, IL, USA.
3 Department of Medicine and Department of Medical Education, Northwestern University Feinberg School of Medicine, Chicago, IL, USA.
4 Division of Cardiology, Department of Medicine, University of Pennsylvania Perelman School of Medicine, Philadelphia, PA, USA.