1. St George's University of London; Division of Mental Health; Cranmer Terrace London UK SW17 0RE
2. University of Southampton; School of Health Sciences; Southampton UK SO17 1BJ
3. University of Oxford; Department of Psychiatry; Warneford Hospital Oxford UK OX3 7JX
4. The Institute of Psychiatry, King's College London; Department of Psychological Medicine; Weston Education Centre London UK SE5 9RJ