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Correction notice This letter has been amended since it was published Online First. The affiliation for Susanne A Schneider was incorrect and this has now been changed.
Contributors RE: assessing the patients, writing the first draft. SAS, NPQ and KPB: assessing the patients, reviewing the paper.
Competing interests None.
Patient consent Obtained.
Provenance and peer review Not commissioned; externally peer reviewed.
▸ Additional material is published online only. To view please visit the journal online (http://dx.doi.org/10.1136/jnnp-2012-304779).