1 Department of Cardiology, University Hospital, Institute of Medical Sciences, University of Opole, Opole, Poland; Faculty of Physical Education and Physiotherapy, Opole University of Technology, Opole, Poland. Electronic address: sacha@op.pl.
2 Department of Cardiology, University Hospital, Institute of Medical Sciences, University of Opole, Opole, Poland.
3 Department of Cardiac Surgery, University Hospital, Institute of Medical Sciences, University of Opole, Opole, Poland.