1. Department of Cardiothoracic Surgery Wroclaw Medical University Wroclaw Poland
2. Department of Cardiac Surgery Children's Memorial Pediatric Health Institute Warsaw Poland
3. Department Cardiac Surgery Thorax Centrum Twente Enschede The Netherlands
4. Department of Cardiac Surgery Medical University of Silesia Katowice Poland
5. Department of Cardiology and Structural Heart Diseases Medical University of Silesia Katowice Poland
6. Silesian College of Medicine Katowice Poland