1. Division of Pediatric Cardiology; Department of Pediatrics; Medical University Graz; Graz Austria
2. Division of Pediatric Cardiology; Johns Hopkins University School of Medicine; Baltimore Maryland
3. Institute for Medical Informatics, Statistics and Documentation; Medical University Graz; Graz Austria
4. Division of Neonatology; Department of Pediatrics; Medical University Graz; Graz Austria
5. Institute of Physiological Chemistry; Centre of Physiological Medicine; Medical University Graz; Graz Austria