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Booij, Johan W; Kuijpers-Jagtman, Anne Marie; Bronkhorst, Ewald M; Livas, Christos; Ren, Yijin; Kuijpers, Mette A R; Katsaros, Christos (2021). Class II Division 1 malocclusion treatment with extraction of maxillary first molars: Evaluation of treatment and post-treatment changes by the PAR Index. Orthodontics & craniofacial research, 24(1), pp. 102-110. Wiley 10.1111/ocr.12412
