University of Greifswald - University Medicine Greifswald, National and Kapodistrian University of Athens - 4th Department of Internal Medicine, Hospital Universitari Vall d'Hebron of Barcelona, University of Greifswald - University Medicine Greifswald, Université de Versailles Saint-Quentin, Autonomous University of Barcelona - Department of Medecine, Hacettepe University, Nicolae Testemițanu State University of Medicine and Pharmacy, Bambino Gesù Children's Hospital, University of Groningen - University Medical Center Groningen, Nemocnica Bory - Penta Hospitals, University of Zagreb, University of Antwerp, Tanta University, University of Greifswald - University Medicine Greifswald, Sanjay Gandhi Post Graduate Institute of Medical Sciences, University of Helsinki - Helsinki University Central Hospital, Université de Tours, University of Southern Denmark, North-West State Medical University, University of Ostrava - University Hospital Ostrava, Medical University of Lublin, Grande Ospedale Metropolitano Niguarda, Guy's and St Thomas' NHS Foundation Trust, University of Basel - University Hospital Basel, Government of Portugal - Unidade Local de Saúde de São João, Government of the Italian Republic (Italy) - Ministry of Health (Italy), Wroclaw Medical University, Institute of Cardiovascular Diseases, University of Greifswald, Clinical Centre of Nis, St Olavs Hospital, Charité–Universitätsmedizin Berlin, Lund University, Institute of Cardiovascular Diseases and Independent