1 Health Service and Population Research, The Institute of Psychiatry, Psychology and Neuroscience, David Goldberg Building, IoPPN, 16 De Crespigny Park, London, SE5 8AF, UK. [email protected].
2 Psychological Medicine, The Institute of Psychiatry, Psychology and Neuroscience, King's College London, London, UK.
3 ESRC Centre for Society and Mental Health, King's College London, London, UK.
4 Health Service and Population Research, The Institute of Psychiatry, Psychology and Neuroscience, David Goldberg Building, IoPPN, 16 De Crespigny Park, London, SE5 8AF, UK.