[1] Cardiff Univ, Sch Med, Welsh Ctr Learning Disabil, Cardiff CF14 1YS, S Glam, Wales
[2] Heathfield, Gloucester, England
[3] Paijat Hame Cent Hosp, Lahti, Finland
[4] Bethel Epilepsy Ctr, Dept Gen Epileptol, Bielefeld, Germany
[5] Peninsula Med Sch, Cornwall Partnership NHS Trust, Neuropsychiat Epilepsy & Memory Serv, Plymouth, Cornwall, England
[6] Bethel Epilepsy Ctr, Bielefeld, Germany
[7] Univ Helsinki, Dept Child Neurol, Helsinki, Finland
[8] Rinnekoti Res Ctr, Espoo, Finland
[9] Ipse Bruggen, Zwammerdam, Netherlands
[10] Epilepsy Ctr, Seguin Clin Adults Severe Intellectual Disabil, Kork, Kehl Kork, Germany
[11] Univ Liverpool, Unit Neurol Sci, Liverpool L69 3BX, Merseyside, England
[12] Monyhull Birmingham & John Moores Univ, Liverpool, Merseyside, England
[13] New York Med Coll, Westchester Inst Human Dev, Valhalla, NY 10595 USA
[14] Kempenhaage, Heeze, Netherlands
[15] Specialist Healthcare Adults Intellectual Disabil, Hobart, Tas, Australia