1. Cavell Centre, Cambridgeshire and Peterborough NHS Foundation Trust, Peterborough, UK;
2. Postgraduate Medical School, University of Hertfordshire, Hatfield, UK;
3. Research Department of Clinical, Educational and Health Psychology, University College London, London, UK;
4. Department of Life & Medical Science, University of Hertfordshire, Hatfield, UK;
5. South West Crisis and Home Treatment Team, Hertfordshire Partnership University NHS Foundation Trust, Hemel Hempstead, UK;
6. East London Foundation NHS Trust, Bedford, UK;
7. Northumberland, Tyne & Wear NHS Foundation Trust, Newcastle, UK;
8. Highly Specialized Obsessive Compulsive Disorders Service, Hertfordshire Partnership University NHS Foundation Trust, Welwyn Garden City, UK;
9. Hertfordshire Partnership University NHS Foundation Trust, Hemel Hempstead, UK