1 Section of Vascular Medicine and Intervention, Division of Cardiology, Massachusetts General Hospital, Boston, MA 02114, USA. Electronic address: krosenfield@fastmail.us.
2 Department of Medicine and Cardiology, Ochsner Medical Center, Ochsner Clinical School of the University of Queensland, John Ochsner Heart and Vascular Institute, Ochsner Medical Institutions, 1514 Jefferson Highway, New Orleans, LA 70121, USA. Electronic address: cwhite@ochsner.org.