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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
Livas, Christos; Halazonetis, Demetrios J; Booij, Johan W; Katsaros, Christos; Ren, Yijin (2016). Does fixed retention prevent overeruption of unopposed mandibular second molars in maxillary first molar extraction cases? Progress in orthodontics, 17, p. 6. Springer 10.1186/s40510-016-0119-z
Booij, Johan W; Goeke, Juliane; Bronkhorst, Ewald M; Pancherz, Hans; Ruf, Sabine; Katsaros, Christos (2011). Overjet correction and space closure mechanisms for Class II treatment by extracting the maxillary first molars. Journal of orofacial orthopedics - Fortschritte der Kieferorthopädie, 72(3), pp. 196-203. München: Urban & Vogel 10.1007/s00056-011-0025-4
