[1] Univ Bristol, Bristol Med Sch, Dept Populat Hlth Sci, Bristol, England
[2] Autism Study Advisor, Bristol, England
[3] Autist UK Char, London, England
[4] NHS England & NHS Improvement, Learning Disabil & Autism Programme, London, England
[5] Avon & Wiltshire Partnership NHS Mental Hlth Trust, Bath, England
[6] Univ Hosp Bristol & Weston NHS Fdn Trust, NIHR Bristol Biomed Res Ctr, Bristol, England
[7] Univ Bristol, Bristol, England
[8] Univ Bristol, Bristol Med Sch, Dept Populat Hlth Sci, Canynge Hall,39 Whatley Rd, Bristol BS8 2PS, England