Jean Régis1,2, J Helen Cross3,4, John F Kerrigan5. 1. Inserm UMR1106, Aix-Marseille University, Marseille, France. 2. Functional and Stereotactic Neurosurgery Service and Gamma Knife Unit, Timone University Hospital, Marseille, France. 3. The Prince of Wales's Chair of Childhood Epilepsy, UCL-Institute of Child Health, Great Ormond Street Hospital for Children, London, United Kingdom. 4. Young Epilepsy, Lingfield, United Kingdom. 5. Pediatric Neurology Division and Hypothalamic Hamartoma Program, Barrow Neurological Institute at Phoenix Children's Hospital, Phoenix, Arizona, U.S.A.