1. Research Department of Primary Care & Population Health; University College London; London United Kingdom
2. Research Department; Young Epilepsy; Lingfield Surrey United Kingdom
3. Gillberg Neuropsychiatry Centre; University of Gothenburg; Gothenburg Sweden
4. Child Development Centre; Crawley Hospital; Crawley West Sussex United Kingdom
5. Great Ormond Street Hospital for Children NHS Trust; London United Kingdom
6. Neurosciences Unit; Institute of Child Health; University College London; London United Kingdom
7. Muir Maxwell Epilepsy Centre; Edinburgh Neurosciences; The University of Edinburgh; Edinburgh United Kingdom
8. College of Medicine; University of Vermont; Burlington Vermont U.S.A
9. Department of Applied Health Research; University College London; London United Kingdom