[1] UCL, Natl Hosp Neurol & Neurosurg, Inst Neurol, Dept Clin & Expt Epilepsy, London, England
[2] Guys & St Thomas NHS Fdn Trust, Sleep, London, England
[3] Newcastle Upon Tyne NHS Fdn Trust, Reg Sleep Serv, Newcastle Upon Tyne, Tyne & Wear, England