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The effect of zonisamide on UPDRS Part IV, No. 33 worsened (a), the effect of zonisamide on UPDRS Part IV, No. 33 improved (b), the effect of zonisamide on UPDRS Part IV, No. 33 unchanged with scores ≥ 1 (c), and the effect of zonisamide on UPDRS Part IV, No. 33 zero (d).
