- Correspondence to Dr Alex Hardip Sohal, Queen Mary University of London, Centre for Primary Care and Public Health, Barts and The London School of Medicine and Dentistry, Yvonne Carter Building, 58 Turner Street, London E1 2AB, UK;
- Received 21 September 2016
- Revised 27 February 2017
- Accepted 16 March 2017
- Published online 19 July 2017.
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