Funding for this research was provided by:
Received: 20 March 2018
Accepted: 16 July 2019
First Online: 24 July 2019
Ethics approval and consent to participate
: This paper is a systematic scoping study that relied strictly on the review of existing literature, no human participants were involved. Therefore, ethical approval and consent to participate by human participants was not applicable.
: Not applicable
: The authors declare that they have no competing interests.