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Van der Heijden MM, Meijer K, Willems PJ, Savelberg HH.Van der Heijden MM, et al. Among authors: willems pj.Gait Posture. 2009 Jul;30(1):110-4. doi: 10.1016/j.gaitpost.2009.04.002. Epub 2009 May 5.Gait Posture. 2009.PMID: 19419871