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Veenema, A C; Katsaros, C; Boxum, S C; Bronkhorst, E M; Kuijpers-Jagtman, A M (2009). Index of Complexity, Outcome and Need scored on plaster and digital models. European journal of orthodontics, 31(3), pp. 281-6. Oxford: Oxford University Press 10.1093/ejo/cjn077
