1. Research Centre of Applied and Preventive Cardiovascular Medicine, University of Turku, Turku, Finland;
2. Department of Pediatrics, University of Turku and Turku University Hospital, Turku, Finland;
3. Department of Medicine, University of Turku and Division of Medicine, Turku University Hospital, Turku, Finland;
4. Department of Pharmacology, Drug Development and Therapeutics, University of Turku, and Unit of Clinical Pharmacology, Turku University Hospital, Turku, Finland;
5. Department of Clinical Chemistry, Fimlab Laboratories and School of Medicine, University of Tampere, Tampere, Finland;
6. Department of Pediatric Cardiology, Hospital for Children and Adolescents and Department of Pediatrics, University of Helsinki, Helsinki, Finland;
7. Department of Pediatrics, University of Tampere and Tampere University Hospital, Tampere, Finland;
8. Department of Pediatrics, Vaasa Central Hospital, Vaasa, Finland;
9. Department of Pediatrics, University of Oulu, Oulu, Finland;
10. Department of Clinical Physiology, University of Eastern Finland and Kuopio University Hospital, Kuopio, Finland;
11. Department of Clinical Physiology and Nuclear Medicine, Turku University Hospital, Turku, Finland