- Correspondence to Augusto Azuara-Blanco, Centre for Public Health, Queen's University Belfast, Institute of Clinical Sciences - Block A, Grosvenor Road, Belfast, BT12 6BA, UK;
- Received 24 April 2017
- Revised 31 July 2017
- Accepted 4 August 2017
- Published online 30 August 2017.
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