Received: 12 April 2019
Accepted: 5 May 2020
First Online: 19 May 2020
Ethics approval and consent to participate
: Ethics approval was not required as the present systematic review reported on publicly available, non-identifiable human data. This is in accordance with Section 5.1.22 of the National Health and Medical Research Council National Statement on Ethical Conduct in Human Research [CitationRef removed].
: Not applicable.
: The authors declare that they have no competing interests.