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Kuijpers-Jagtman, Anne Marie; Nollet, Pieter J P M; Semb, Gunvor; Bronkhorst, Ewald M; Shaw, William C; Katsaros, Christos (2009). Reference photographs for nasolabial appearance rating in unilateral cleft lip and palate. Journal of craniofacial surgery, 20 Suppl 2, pp. 1683-1686. Hagerstown, Md.: Lippincott Williams & Wilkins 10.1097/SCS.0b013e3181b3ed9c
