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Varying the item format improved the range of measurement in patient-reported outcome measures assessing physical function
Gandek, Gregor Lieglrbara; H Felix Fischer; Bjorner, Jakob B; Ware, John E; Rose, Matthias
; et al.
Arthritis Research & Therapy; London Vol. 19, (2017).
DOI:10.1186/s13075-017-1273-5
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