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

FilenameFormatSizeDescription
mds21973-MDS21973.mpg5871KSeconds 1-7. The patient is instructed to turn his head maximally to the right and to the left.Seconds 8-13. Note the extensive (obviously painful) pulse-generator movements.Seconds 14-21. The patient is instructed to maximally flex and extend the neck.Seconds 22-26. Note again the pulse-generator movements.

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