1. Department of Psychiatry, Queen Elizabeth II Hospital, Welwyn Garden City, Hertfordshire, AL7 4HQ, UK and Department of Psychology, University of Hertfordshire, College Lane, Hatfield, Hertfordshire, AL10 9AB, UK,
2. Department of Psychiatry, Queen Elizabeth II Hospital, Welwyn Garden City, Hertfordshire, AL7 4HQ, UK and Department of Psychology, University of Hertfordshire, College Lane, Hatfield, Hertfordshire, AL10 9AB, UK
3. Department of Psychiatry, Queen Elizabeth II Hospital, Welwyn Garden City, Hertfordshire, AL7 4HQ, UK