Urbanek, Bożena, Department of Electrocardiology, Medical University of Lodz, Lodz, Poland Urbanek, Piotr Urbanek, Piotr, Institute of Cardiology, Arrhythmia Department, Warsaw, Poland Urbanek, Piotr Urbanowicz, Iwona Urbanowicz, Tomasz, Department of Cardiac Surgery and Transplantology, Chair of Cardio-Thoracic Surgery, Poznan University of Medical Sciences, Poznan, Poland Urbanowicz, Tomasz Urbanowicz, Tomasz (Poland) Urbańska, Ewa Urbien, Rhyan, University of Witten/Herdecke Ureña, Isabel Urena, Marina Uretsky, Seth Uribarri, Aitor Urondo, Ludmila San Vicente Urra, Francisco Garcia Urselli, Rossella Uruski, Paweł Uskela, Sanna Ustun, Elif Ezgi, Cardiology Department, Ankara University Ankara Usui, Akihiko Usui, Soichiro, Department of Disease Control and Homeostasis, Kanazawa University Graduate School of Medical Science, Kanazawa, Ishikawa, Japan Uszok-Stenzel, Ewa Utrera-Lagunas, Marcelo Utsunomiya, Daisuke