269 FREEZING IN PARKINSON'S DISEASE: A PILOT FMRI STUDY - Vercruysse, S.; Spildooren, J.; Heremans, E.; Kerckhofs, E.; Swinnen, S.; Wenderoth, N.; Vandenberghe, W.; Nieuwboer, A. (Parkinsonism & Related Disorders, 2010)