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Voorn EL, Gerrits KH, Koopman FS, Nollet F, Beelen A.Voorn EL, et al. Among authors: koopman fs.Arch Phys Med Rehabil. 2014 May;95(5):935-40. doi: 10.1016/j.apmr.2014.01.015. Epub 2014 Jan 31.Arch Phys Med Rehabil. 2014.PMID: 24491465Clinical Trial.