1. Epidemiology and Statistics Office of the Research Unit and Área de Pediatria Médica do Hospital de Dona Estefânia; Centro Hospitalar de Lisboa Central; Lisbon Portugal
2. Institute of Health and Society; Royal Victoria Infirmary; Sir James Spence Institute; Newcastle University; Newcastle-upon-Tyne UK
3. The Cerebral Palsy Register of Norway; Vestfold Hospital Trust and Department of Laboratory Medicine; Women's and Children's Health; The Norwegian University of Science and Technology; Trondheim Norway
4. Federação das Associações Portuguesas de Paralisia Cerebral, Avenida Rainha Dona Amélia; Lisbon Portugal
5. Rehabilitation Center ‘Mes esam lidzas’; Riga Latvia
6. Department of Paediatrics; Institute of Clinical Sciences; Queen Silvia Children's Hospital; Sahlgrenska Academy at the University of Gothenburg; Göteborg Sweden
7. Children's Rehabilitation Hospital affiliated to the Hospital of Lithuanian University of Health Sciences; Kaunas Lithuania
8. Department of Paediatrics; Aarhus University Hospital; Aarhus Denmark
9. Clinical Research Unit; Imas12-Ciberesp; Hospital 12 Octubre; Madrid Spain