Popiak, Hubert, 1st Department of Cardiology, Poznan University of Medical Sciences, Poznan, Poland Popiel, Małgorzata, Departament of Cardiology, University of Medical Sciences in Poznań, Poland Popiel, Małgorzata Popiel, Zbigniew Popiela, Tadeusz Popiela, Tadeusz J. Popiela, Tadeusz Popielarz-Grygalewicz, Agata, Cardiology Clinical of Physiotherapy Division of the 2nd Faculty of Medicine, Medical University of Warsaw, Bielański Hospital in Warsaw Popielarz-Grygalewicz, Agata Popiołek, Lech Popov, Aron-Frederik, Department of Cardiothoracic Transplantation and Mechanical Circulatory Support, Royal Brompton & Harefield NHS Foundation Trust, London, United Kingdom Popov, Aron-Frederik, Department of Cardiothoracic Transplantation and Mechanical Circulatory Support, Royal Brompton & Harefield NHS Foundation Trust, London, United Kingdom Popov, Aron-Frederik Popov, Hristo, “Medica Core” Cardiology Hospital, Ruse, Bulgaria Popovici, Mihail Popow, Michał Popow, Michał, Department of Internal Medicine and Endocrinology, Medical University of Warsaw, Warsaw, Poland (Poland) Poprawski, Grzegorz Poprawski, Kajetan Poprocka, Justyna Popusoi, Grigore Porada, Adam Poręba, Małgorzata Poręba, Rafał Poręba, Ryszard