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5 Stades de Hoenh et Yahr 2-4 1-2.5 Samyra H.J. Keus, MartenMunneke, Maarten J. Nijkrake, GertKwakkel, BastiaanR. Bloem, Physical Therapy in Parkinson’s Disease: Evolution and Future Challenges, MovementDisorders Vol. 24, No. 1, 2009, pp. 1–14 2008 MovementDisorder Society