- Correspondence to Dr Jill M Zelin, Barts Health NHS Trust, Bart's Sexual Health Centre, Kenton and Lucas Block, St Bartholomew's Hospital, West Smithfield, London EC1A 7BE, UK;
- Received 28 February 2017
- Revised 11 June 2017
- Accepted 11 June 2017
- Published in print 4 August 2017.
- Published online 5 August 2017.
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