Kręcki, Radosław, 2nd Chair of Cardiology, Medical University of Łódź, Bieganski Hospital, Łódź, Poland Kręcki, Radosław, 2^nd Chair and Department of Cardiology, Medical University, Łódź, Poland Kręcki, Radosław Kręcki, Radosław, 12nd Department of Cardiology, Medical University, Lodz, Poland Kreft, Ewelina Kreft, Ewelina, Department of Monitored Therapy and Pharmacogenetics (Poland) Kreidel, Felix Krejca, Michał Kremis, Elżbieta Kremser, Christian Krenc, Zbigniew, Katedra Pediatrii Wojskowej Akademii Medycznej w Łodzi Krenke, Rafał Kreuz, Jens, University Bonn Krintus, Magdalena Krishnamoorthy, Parasuram, Englewood Hospital and Medical Center Krishnan, Balaji, Cardiac Arrhythmia/Syncope Center (Syncope Clinic), Cardiovascular Division, University of Minnesota Medical School, Minneapolis, Minnesota, United States Krisper, Maximilian Krizanovic-Grgic, Iva Kroeger, Knut Kroening, Daniel Król, Anna Król, Grzegorz Bojarski i Anna Król, Marek Król, Paweł Król-Jawień, Wanda