1. Department of Cardiology, St Vinzenz Hospital Cologne , Cologne , Germany
2. Department of Cardiology, Technische Universität Dresden (Campus Chemnitz), Klinikum Chemnitz , Chemnitz , Germany
3. Department of Cardiology, University Hospital RWTH Aachen , Aachen , Germany
4. Department of Cardiac Surgery and Transplant Unit, Royal Brompton & Harefield NHS Foundation Trust Harefield Hospital , Harefield , UK
5. UOC Interventistica Cardiologica e Diagnostica Invasiva, Fondazione Policlinico Gemelli IRCCS and Università Cattolica del Sacro Cuore , Rome , Italy