1. University of Birmingham Centre for Cardiovascular Sciences; City Hospital; Birmingham B18 7QH UK
2. Service de Cardiologie, Pôle Coeur Thorax Vasculaire, Centre Hospitalier, Universitaire Trousseau et Faculté de Médecine; Université François Rabelais; Tours France
3. Department of Cardiology; Copenhagen University Hospital Gentofte; Hellerup 2900 Denmark