1. British Heart Foundation Centre for Cardiovascular Research Excellence, King's College London , 125 Coldharbour Lane, London, SE5 9NU , UK
2. Worcestershire Acute Hospitals NHS Trust, Charles Hastings Way , Way, Worcester, WR5 1DD , UK
3. Division of Cardiovascular Medicine, Creighton University, The Catholic Health Initiative Heart and Vascular Institute , 7500 Mercy Rd, Omaha, NE 68124 , USA