1. Highly Specialized Service for OCD and BDD, Hertfordshire Partnership University NHS Foundation Trust, Welwyn Garden City, UK
2. Department of Biomedical and Neuromotor Sciences, University of Bologna, Bologna, Italy
3. School of Life and Medical Sciences, University of Hertfordshire, Hatfield, UK
4. Department of Medicine, Surgery and Health Sciences, UCO Clinica Psichiatrica, University of Trieste, Trieste, Italy
5. University of Cambridge School of Clinical Medicine, Cambridge, UK