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Article History

Received: 12 March 2019

Accepted: 11 September 2019

First Online: 24 October 2019

Compliance with ethical standards

:

: The authors declare that they have no conflict of interest.

: We have been respectful in our use of the data from all the studies included for review. REB approval was not needed as the study used previously published research which has had ethical approval and is also entirely in the public domain. No additional data were sought by us or were provided to us for analysis by the original authors. As such, our study did not require ethical approval by our host institution, City, University of London, nor is there any regulatory or legal requirement for such work to require ethical approval in the UK.