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

FilenameFormatSizeDescription
jws-mds.20925.mpg6997K Segment 1. Stanley Fahn explaining the origins of the modern PT and how to perform the test. Segment 2. The late C. David Marsden performing the PT with some interesting subtleties.

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