- Correspondence to Prof Peymané Adab, Public Health, Epidemiology and Biostatistics, The University of Birmingham, Edgbaston B15 2TT, Birmingham;
- Received 11 August 2016
- Revised 30 March 2017
- Accepted 17 May 2017
- Published in print 7 September 2017.
- Published online 12 September 2017.
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