1. Department of Pediatrics, Kuopio University Hospital, Kuopio, Finland;
2. Faculty of Health Sciences, Institute of Clinical Medicine, University of Eastern Finland, Kuopio, Finland;
3. Department of Medicine, Kuopio University Hospital, Kuopio, Finland;
4. Siun sote – North Carelia Central Hospital, Joensuu, Finland;
5. Laboratory Division, Turku University Central Hospital, Turku, Finland;
6. Department of Clinical Chemistry, Faculty of Medicine, University of Turku, Turku, Finland;
7. Eastern Finland Laboratory Center, Kuopio, Finland