Elin Lööf1,2, Hanneke Andriesse3, Eva W Broström1,4, Marie André2, Stephanie Böhm1,4, Sven Bölte5,6. 1. Paediatric Neurology, Department of Women's and Children's Health, Karolinska Institutet, Karolinska University Hospital, Stockholm, Sweden. 2. Functional Area Occupational Therapy and Physiotherapy, Allied Health Professionals Function, Karolinska University Hospital, Stockholm, Sweden. 3. Department of Orthopaedics, Skånes University Hospital, Lund, Sweden. 4. Highly Specialised Paediatric Orthopaedics and Paediatric Medicine, Astrid Lindgren Children's Hospital, Karolinska University Hospital, Stockholm, Sweden. 5. Center of Neurodevelopmental Disorders (KIND), Centre for Psychiatry Research, Department of Women's and Children's Health, Karolinska Institutet and Child and Adolescent Psychiatry, Stockholm Health Care Services, Stockholm County Council, Stockholm, Sweden. 6. Curtin Autism Research Group, Essential Partner Autism CRC, School of Occupational Therapy, Social Work and Speech Pathology, Curtin University, Perth, WA, Australia.