1. Estonian MS Centre, West-Tallinn Central Hospital, Tallinn University, Tallinn, Estonia; Estonian MS Centre, West-Tallinn Central Hospital, Tallinn University, Tallinn, Estonia
2. Institute of Psychology, Tallinn University, Tallinn, Estonia
3. Institute of Psychology, University of Tartu, Tartu, Estonia
4. Department of Paediatrics, University of Tartu, Tartu, Estonia
5. Unit of Neurology, Tartu University Hospital Children’s Clinic, Tartu, Estonia; Unit of Neurology, Tartu University Hospital Children’s Clinic, Tartu, Estonia