1. Norwegian Cerebral Palsy Registry, Tonsberg, Norway
2. Habilitation center, Vestfold Hospital, Tønsberg, Norway
3. Department of Laboratory Medicine, Children's and Women's Health, Norwegian University of Science and Technology, Trondheim, Norway
4. Habilitation Center, Vestfold Hospital Tønsberg, Norway
5. Department of Laboratory Medicine, Children's and Women's Health, Norwegian University of Science and Technology Trondheim, Norway
6. Department of Women's and Children's Health, St. Olav University Hospital Trondheim, Norway