Department of Cardiology, University Medical Centre Groningen, University of Groningen, Hanzeplein 1, 9713 GZ, Groningen, The Netherlands. Ziekenhuis Oost-Limburg, Genk, Belgium. University of Bergen, Bergen, Norway. Stavanger University Hospital, Stavanger, Norway. Department of Heart Diseases, Poland and Cardiology Department, Military Hospital, Wroclaw Medical University, Wrocław, Poland. Division of Molecular and Clinical Medicine, School of Medicine, Ninewells Hospital and Medical School, University of Dundee, Dundee, UK. Department of Cardiovascular Sciences, University of Leicester, Leicester, UK. NIHR Leicester Biomedical Research Centre, Glenfield Hospital, Leicester, LE3 9QP, UK. Department of Cardiology (CVK), and Berlin-Brandenburg Center for Regenerative Therapies (BCRT), German Centre for Cardiovascular Research (DZHK) Partner Site Berlin, Charité Universitätsmedizin Berlin, Berlin, Germany. Department of Cardiology and Pneumology, University Medical Center Göttingen (UMG), Göttingen, Germany. Heart Failure Unit, Department of Cardiology, School of Medicine, Athens University Hospital Attikon, National and Kapodistrian University of Athens, Athens, Greece. School of Medicine, University of Cyprus, Nicosia, Cyprus. National Heart and Lung Institute, Royal Brompton and Harefield Hospitals, Imperial College, London, UK. INSERM, Centre D'Investigations Cliniques Plurithématique 1433, Université de Lorraine, CHRU de Nancy and F-CRIN INI-CRCT, Nancy, France. Department of Medical and Surgical Specialties, Radiological Sciences and Public Health, Institute of Cardiology, University of Brescia, Brescia, Italy. Department of Cardiology, University Medical Centre Groningen, University of Groningen, Hanzeplein 1, 9713 GZ, Groningen, The Netherlands. a.a.voors@umcg.nl.