1. Tuscany Foundation “G. Monasterio”; Massa Pisa Italy
2. Adult and Pediatric Cardiac Surgery; University of Naples Federico II; Naples Italy
3. Institute of Clinical Physiology; Pisa Italy
4. Division of Pediatric Cardiology; Department of Pediatrics; Medical University Graz; Graz Austria
5. Children's Hospital and Medical Center; University of Nebraska Medical Center; Omaha NE USA