1. Pediatric Cardiology and Cardiac Surgery Stabilimento Ospedaliero di Massa Ospedale del Cuore G Pasquinucci Massa Toscana USA
2. Institute of Clinical Physiology (IFC) National Research Institute (CNR) Pisa Italy
3. Department of Pediatrics University of Pisa Pisa Italy
4. Division of Pediatric Cardiology Department of Pediatrics Medical University Graz Graz Austria
5. University of Naples “Federico II” Naples Italy
6. Johns Hopkins Medicine, Pediatrics Baltimore MD USA