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doi.org/10.1002/9781444397970.ch32, hdl.handle.net/1765/86621

Grimbergen, Y. A. M., Speelman, A. D., van der Marck, M. A., Schoon, Y., & Bloem, B. (2011). Gait, Postural Instability, and Freezing. doi:10.1002/9781444397970.ch32