[1] Med Univ Lublin, Dept Neurol, PL-20954 Lublin, Poland
[2] Inst Neurol, Dept Neuroinflammat, London WC1, England
[3] Stanford Univ, Ctr Narcolepsy, Stanford, CA 94305 USA
[4] UCL Natl Hosp Neurol & Neurosurg, Neurosurg Intens Care Unit, London WC1N 3BG, England
[5] UCL Natl Hosp Neurol & Neurosurg, Victor Horsley Dept Neurosurg, London WC1N 3BG, England