Olszówka, Piotr Olszowska, Maria Olszowska, Maria, Department of Cardiac and Vascular Diseases, Institute of Cardiology, Jagiellonian University Medical College, Krakow Olszowska, Maria Olszowska, Maria (Poland) Olszyna-Seremeta, Marta Omar, Timur Bigmourad, Istanbul University, Cerrahpasa Faculty of Medicine, Department of Cardiology Omran, Heyder Onciul, Sebastian Oner, Ender, Mehmet Akif Ersoy, Cardiovascular Surgery Education and Research Hospital Oner, Ender, Mehmet Akif Ersoy Thoracic and Cardiovascular Surgery Training and Research Hospital Oner, Ender, Department of Cardiology, Mehmet Akif Ersoy Thoracic and Cardiovascular Surgery Center, Training and Research Hospital, Istanbul/TURKEY Oneto-Otero, Jesús, Jerez Hospital Ongen, Zeki, Istanbul University, Cerrahpasa Faculty of Medicine, Department of Cardiology Onichimowski, Dariusz Onish, Karina Onishi, Hirokazu Onishi, Hirokazu Onisk, Grzegorz Oniszh, Karina Onsun, Nahide, Bezmialem Vakif University,Faculty of Medicine, Cardiology Department,Istanbul-TURKEY Oomman, Abraham Opacian-Bojanowska, Monika Opacian-Bojanowska, Monika Opala, Grzegorz