n.— «We have assessed the effect of Zimmer, rollator and gutter frames on 6-min walking distance and on arterial oxygenation during exercise in elderly patients with COPD.» —“The effect of walking aids on exercise capacity and oxygenation in elderly patients with chronic obstructive pulmonary disease” by Jamal Roomi, Abebaw M. Yohannes, Martin J. Connolly Age and Ageing (Oxford, Eng.) Nov., 1998. (source: Double-Tongued Dictionary)

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