1. Department of Paediatrics; North Karelia Central Hospital; Joensuu Finland
2. Department of Paediatrics; University of Eastern Finland; Kuopio Finland
3. Institute of Public Health and Clinical Nutrition; University of Eastern Finland; Kuopio Finland
4. Health Department; National Institute for Health and Welfare; Helsinki Finland
5. Joint municipal authority of social and health care in North Karelia; Joensuu Finland
6. School of Medicine; University of Eastern Finland; Kuopio Finland
7. Department of Paediatrics; Mikkeli Central Hospital; Mikkeli Finland
8. Department of Paediatrics; Kuopio University Hospital; Kuopio Finland