- Correspondence to Dr F de Vocht, School of Social and Community Medicine, University of Bristol, Canynge Hall, 39 Whatley Road, Bristol BS8 2PS, UK;
- Received 9 May 2016
- Revised 24 June 2016
- Accepted 1 July 2016
- Published in print 1 February 2017.
- Published online 10 January 2017.
- Published first 11 August 2016.
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