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Aghayev, Emin; Henning, Julia; Munting, Everard; Diel, Peter; Moulin, Patrick; Röder, Christoph; SWISSspine, and Spine Tango Registry groups (2012). Comparative effectiveness research across two spine registries. European spine journal, 21(8), pp. 1640-7. Berlin: Springer-Verlag 10.1007/s00586-012-2256-5
