Funding for this research was provided by:
European Cooperation in Science and Technology (IS1405)
Received: 18 August 2018
Accepted: 9 December 2018
First Online: 3 January 2019
Ethics approval and consent to participate
: This is a protocol for a systematic review which utilises published data, and as such, ethical approval is not required for this study. Wide dissemination of the findings of this study will be undertaken via peer-reviewed publications and conference presentations.
: Not applicable.
: The authors declare that they have no competing interests.
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