- Correspondence to Dr Johnny Downs, Department of Psychological Medicine, King's College London, De Crespigny Park, Box 63, London SE5 8AF, UK;
- Received 20 October 2016
- Revised 11 December 2016
- Accepted 12 December 2016
- Published in print 1 July 2017.
- Published online 21 June 2017.
- Published first 27 January 2017.
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