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Oesch, P R; Hilfiker, R; Kool, J P; Bachmann, S; Hagen, K B (2010). Perceived functional ability assessed with the spinal function sort: is it valid for European rehabilitation settings in patients with non-specific non-acute low back pain? European spine journal, 19(9), pp. 1527-33. Berlin: Springer 10.1007/s00586-010-1429-3
