Statistics from Altmetric.com
Contributors MPS conceived the idea, performed the literature search, wrote the manuscript draft and is the guarantor. SLD contributed to drafting of the manuscript, edited the draft and performed a critical review of the manuscript. OAU critically reviewed the manuscript.
Funding The authors have not declared a specific grant for this research from any funding agency in the public, commercial or not-for-profit sectors.
Competing interests None declared.
Provenance and peer review Not commissioned; internally peer reviewed.
If you wish to reuse any or all of this article please use the link below which will take you to the Copyright Clearance Center’s RightsLink service. You will be able to get a quick price and instant permission to reuse the content in many different ways.