- 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 13 May 2015
- Revised 26 August 2015
- Accepted 14 September 2015
- Published in print 1 March 2016.
- Published online 11 February 2016.
- Published first 10 November 2015.
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