1 Department of Paediatric and Adult Neurosurgery, King's College Hospital NHS Foundation Trust, Denmark Hill, London, SE5 9RS, UK. jose.pedro.lavrador@gmail.com.
2 Evelina London Children's Hospital, Guy's and St Thomas's NHS Foundation Trust, Westminster Bridge Road, London, SE1 7EH, UK.
3 Neurofibromatosis Centre, Guy's Hospital, London, UK.
4 Department of Paediatric and Adult Neurosurgery, King's College Hospital NHS Foundation Trust, Denmark Hill, London, SE5 9RS, UK.