[1] Cardiff Univ, Inst Psychol Med & Clin Neurosci, Cardiff, S Glam, Wales
[2] Abertawe Bro Morgannwg Univ Hlth Board, Psychiat Intellectual Disabil, Baglan, Port Talbot, Wales
[3] UCL, Inst Neurol, London, England
[4] HS Greater Glasgow & Clyde, Glasgow, Lanark, Scotland
[5] Northampton Gen Hosp NHS Trust, Northampton, England
[6] Abertawe Bro Morgannwg Univ Hlth Board, Baglan, Port Talbot, Wales
[7] Royal Coll Psychiatrists, Fac Psychiat Intellectual Disabil, London, England
[8] Cornwall Partnership NHS Fdn Trust, Exeter Med Sch, Bodmin, Cornwall, England