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Median UPDRS-III total sums, left body sums and right body sums for all four conditions. Lateralized values were derived from items 20–26. ON = DBS On, OFF = DBS OFF, veR = Ventral contact of right electrode active and left electrode off, veL = Ventral contact of left electrode active and right electrode off. Error bars denote the interquartile range. *Denotes significant differences (signed-rank test, p < 0.05).
