1. Department of Research, Sunnaas Rehabilitation Hospital and Section for Child Neurology, Rikshospitalet University Hospital, Oslo, Norway
2. Department of Occupational Therapy, Sunnaas Rehabilitation Hospital, Oslo, Norway
3. Section for Biostatistics, Rikshospitalet University Hospit, Oslo, Norway
4. Department of Research, Sunnaas Rehabilitation Hospital and I Holm Department of Physiotherapy, Rikshospitalet University Hospital, Oslo, Norway