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▸ 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.
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