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This article includes supplementary video clips, available online at http://www.interscience.wiley.com/jpages/0885-3185/suppmat.

FilenameFormatSizeDescription
jws-mds.21469.mpg9906KSegment 1. Patient before treatment. Note the marked extension spasms of the trunk whenever she tries to sit or stand.Segment 2. Patient after treatment with valproic acid. Only sparse and mild extension spasms of the trunk are seen when the patient is trying to sit or stand. The patient is able to walk alone with a walking aid.

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