1. Lund University, Skane University Hospital, Department of Clinical Sciences Lund, Orthopedics, Lund, Sweden
2. Arcada University of Applied Sciences, Helsinki, Finland
3. Oslo University Hospital, Cerebral Palsy Follow-up Program, Department of Neurosciences for Children, Oslo, Norway
4. University of Oslo, Faculty of Medicine, Research Center of Habilitation and Rehabilitation Models and Services (CHARM), Oslo, Norway
5. Cerebral Palsy Registry of Norway, Vestfold Hospital Trust, Tønsberg, Norway
6. Norwegian University of Science and Technology, Faculty of Medicine and Health Sciences, Department of Clinical and Molecular Medicine, Trondheim, Norway