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Kessler, J T; Melloh, M; Zweig, Thomas; Aghayev, E; Röder, C (2011). Development of a documentation instrument for the conservative treatment of spinal disorders in the International Spine Registry, Spine Tango. European spine journal, 20(3), pp. 369-79. Berlin: Springer-Verlag 10.1007/s00586-010-1474-y
