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Gorbach, Christoph; Schmid, Marius R.; Elfering, Achim; Hodler, Juerg; Boos, Norbert (2006). Therapeutic Efficacy of Facet Joint Blocks. AJR, American journal of roentgenology, 186(5), pp. 1228-1233. Leesburg, Va.: American Roentgen Ray Society 10.2214/AJR.04.1042