1. Department of Cardiology Oslo University Hospital Rikshospitalet Oslo 0027 Norway
2. Department of Pediatric Cardiology Oslo University Hospital Oslo 0027 Norway
3. Intervention Center Oslo University Hospital Rikshospitalet Oslo 0027 Norway
4. Bakken Research Centre Medtronic Plc, Maastricht The Netherlands
5. Institute for Surgical Research Oslo University Hospital Rikshospitalet Oslo 0027 Norway