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.
Competing interests: None.
Funding: MSJB is funded as a Clinical Research Fellow by Bausch and Lomb. EJM is funded by a National Career Scientist Award from the Department of Health, and NHS Research and Development.