1. Children's Hospital; Kuopio University Hospital; Kuopio Finland
2. Department of Child; Adolescent and Developmental Neurology; University Children's Hospital; Ljubljana Slovenia
3. Department of Paediatrics; University of Montreal; Montreal QC Canada
4. Department of Neurology and Epileptology; State Institute of Paediatrics and Paediatric Surgery; Moscow Russia
5. Department of Child Neurology; University of Pecs; Pecs Hungary
6. Department of Ophthalmology; University of Pecs; Pecs Hungary
7. Department of Ophthalmology; University Medical Centre; Ljubljana Slovenia
8. University Children's Hospital; Zurich Switzerland
9. Department of Ophthalmology; Kuopio University Hospital; Kuopio Finland