1. Department of Cardiology, MedStar Heart and Vascular Institute, Washington, DC (P.H.L.).
2. Georgetown University, Washington, DC (P.H.L.).
3. Department of Cardiology, WellSpan Heart and Vascular Center, York, PA (C.A.A.C.).
4. Barts Heart Centre, London, United Kingdom (C.A.A.C.).