1 Division of Cardiology, Department of Medicine, Northwestern University Feinberg School of Medicine, Chicago, Illinois. Electronic address: [email protected].
2 Division of Cardiology, Department of Medicine, Northwestern University Feinberg School of Medicine, Chicago, Illinois.
3 Department of Cardiovascular Medicine, Mayo Clinic Hospital, Rochester, Minnesota.
4 Department of Medicine, Westchester Medical Center and New York Medical College, Valhalla, New York.