1. Adolescent Autism Unit, Teesside University, Teesside, Middlesbrough TS 21 3EE, UK
2. Psychology Department, Teesside University, Middlesbrough TS1 3BX, UK
3. Department of Rheumatology, James Cook University Hospital, Middlesbrough TS4 3BW, UK
4. Medical School, University of Newcastle Upon Tyne, Newcastle upon Tyne NE2 4HH, UK