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.
▸ Additional material is published online only. To view please visit the journal online (http://dx.doi.org/10.1136/practneurol-2012-000500).
Contributors VKP conceived and wrote the manuscript. PS, ZN, VK collected data and helped in editing and revising the manuscript.
Competing interests None.
Patient consent Obtained.
Provenance and peer review Not commissioned. Externally peer reviewed.