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Booij, Johan Willem; Goeke, Juliane; Bronkhorst, Ewald Maria; Katsaros, Christos; Ruf, Sabine (2013). Class II treatment by extraction of maxillary first molars or Herbst appliance: dentoskeletal and soft tissue effects in comparison. Journal of orofacial orthopedics - Fortschritte der Kieferorthopädie, 74(1), pp. 52-63. Springer 10.1007/s00056-012-0112-1
