- Correspondence to Dr Filippos T Filippidis, Department of Primary Care and Public Health, School of Public Health, Imperial College London, 310 Reynolds Building, St. Dunstan's Road, London W6 8RP, UK;
- Received 12 October 2016
- Revised 19 April 2017
- Accepted 21 April 2017
- Published online 23 August 2017.
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