Statistics from Altmetric.com
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.
Contributors MRT conceived the study and performed all analysis and writing.
Competing interests None.
Ethics approval None was sought.
Provenance and peer review Not commissioned; internally peer reviewed.