Maastricht University - Centre for Heart Failure Research, Cardiovascular Research Institute Maastricht (CARIM), Maastricht University - Centre for Heart Failure Research, Cardiovascular Research Institute Maastricht (CARIM), University Medical Center Hamburg- Eppendorf - Department of Intensive Care Medicine, Johannes Kepler University Linz, University Hospital 12 de Octubre, Central Lisbon Hospital Center, Helios Klinikum Erfurt, Ministry of Interior in Warsaw - Central Clinical Hospital, Fondazione Policlinico Universitario Agostino Gemelli IRCCS, Karolinska Institutet - ECMO Centre Karolinska, NHS Foundation Trust - Royal Papworth Hospital, Centro Hospitalar Universitário de Lisboa Central - Medical Emergency Unit, Sapienza University of Rome, University of Pittsburgh - Instituto Mediterraneo per i Trapianti e Terapie ad Alta Specializzazione (ISMETT), Royal Brompton Hospital - Department of Anaesthesia and Critical Care, Goethe University Frankfurt, Heinrich Heine University Dusseldorf, University of Freiburg - University Hospital of Freiburg, University of Ostrava - University Hospital Ostrava, KU Leuven, University of Bern, North Estonian Regional Hospital Cancer Centre, Medical University of Vienna, Istanbul University - Istanbul University-Cerrahpasa, Rambam Medical Center, Guy's and St Thomas' NHS Foundation Trust, Hospital Universitari Vall d’Hebron - Department of Intensive Care, University Hospital Regensburg - Department of Internal Medicine II, General University Hospital - 2nd Department of Internal Cardiovascular Medicine and Maastricht University Medical Center - ECLS Centrum