1. Division of Pediatric Cardiology Department of Pediatrics Medical University Graz Graz Austria
2. Institute for Medical Informatics, and Statistics and Documentation Medical University Graz Graz Austria
3. Fondazione CNR‐Regione Toscana G. Monasterio Massa and Pisa Italy
4. Department of Pediatric Cardiology and Critical Care Hannover Medical School Hannover Germany