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Wertli, M M; Rossi, D; Burgstaller, J M; Held, U; Ulrich, N H; Farshad, M; Steurer, J; Brunner, F (2023). Validity of outcome measures used in randomized clinical trials and observational studies in degenerative lumbar spinal stenosis. Scientific reports, 13(1), p. 1068. Springer Nature 10.1038/s41598-022-27218-3
