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    Combining online and in-person methods to evaluate the content validity of PROMIS fatigue short forms in rheumatoid arthritis

    Fatigue is frequent and often severe and disabling in RA, and there is no consensus on how to measure it. We used online surveys and in-person interviews to evaluate PROMIS Fatigue 7a and 8a short forms (SFs) ...

    S. J. Bartlett, A. K. Gutierrez, A. Butanis, V. P. Bykerk… in Quality of Life Research (2018)