1. National Hospital for Neurology and Neurosurgery, University College London Hospitals NHS Foundation Trust, Queen Square, London, WC1N 3BG, UK.
2. Women's and Children's Hospital, North Adelaide, SA, Australia.
3. Department of Diagnostic Imaging, Medical University Sofia, Sofia, Bulgaria.
4. Great Ormond St Hospital for Children NHS Foundation Trust, London, United Kingdom.
5. Guy's and St Thomas' NHS Foundation Trust, London, United Kingdom.
6. Evelina London Children's Hospital, London, United Kingdom.
7. King's College Hospital NHS Foundation Trust, London, United Kingdom.