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 All authors contributed to the article and were involved with the planning and layout of the work. JC prepared and wrote the article, and is responsible for the overall content. DHS, AdB and UT offered critical appraisal of the manuscript.
Competing interests None declared.
Provenance and peer review Commissioned; externally peer reviewed.