University of Glasgow , London , UK) Walker , Roy S. (Consultant Cardiologist , Scottish National Advanced Heart Failure Service , Golden Jubilee National Hospital , Clydebank , and Honorary Professor , UK) Gardner , Daniel J. (Clinical Research Fellow , University of Glasgow Cardiology Speciality Registrar , UK) Doherty , Theresa A. (Consultant Cardiologist , King’s College Hospital , London and Professor of Heart Failure King's College , UK) McDonagh , Niki L. (Consultant Cardiologist , Scottish Adult Congenital Cardiac Service