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Nixdorf, D R; Drangsholt, M T; Ettlin, Dominik A; Gaul, C; De Leeuw, R; Svensson, P; Zakrzewska, J M; De Laat, A; Ceusters, W (2012). Classifying orofacial pains: a new proposal of taxonomy based on ontology. Journal of Oral Rehabilitation, 39(3):161-169.