1. School of Clinical Medical Sciences (Child Health), Newcastle University, United Kingdom, , Department of Paediatric Neurology, Newcastle General Hospital, Newcastle Upon Tyne, United Kingdom
2. Department of Dermatology, Royal Victoria Infirmary, Newcastle Upon Tyne, United Kingdom
3. Department of Cellular Pathology, Royal Victoria Infirmary, Newcastle Upon Tyne, United Kingdom
4. Department of Paediatric Neurology, Newcastle General Hospital, Newcastle Upon Tyne, United Kingdom