- Correspondence to Dr Frank de Vocht, School of Social and Community Medicine, University of Bristol, Canynge Hall, 39 Whatley Road, Bristol BS8 2PS, UK;
- Received 12 January 2017
- Revised 6 April 2017
- Accepted 17 May 2017
- Published in print 1 September 2017.
- Published online 8 August 2017.
- Published first 5 July 2017.
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