1. CNR, Institute of Clinical Physiology; Pediatric Hospital Bambino Gesù; Rome Italy
2. Department of Pediatric Cardiology and Cardio Surgery; Pediatric Hospital Bambino Gesù; Rome Italy
3. Nałecz Institute of Biocybernetics and Biomedical Engineering; PAS; Warsaw Poland
4. Department of Cardiac Surgery; Catholic University of Leuven; Leuven Belgium