Letter to the editor
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.
You do not have access to the full text of this article, the first page of the PDF of this article appears above.
Competing interests None.
Provenance and peer review Not commissioned; internally peer reviewed.