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Assessment of fatigue severity using a numerical rating scale and visual analogue scale Fatigue severity was accessed using the same self-rating instrument for the two groups, which included a numerical rating scale (NRS) and visual analogue scale (VAS)

[DOI] [PubMed] [Google Scholar] [121].Witkowski A, Joshi AK, Smith S

doi: 10.1111/j.1748-1716.2010.02237.x 43
Further studies in larger and more diverse populations are warranted
