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Tsichlaki, Aliki; Chin, Siew Yee; Pandis, Nikolaos; Fleming, Padhraig S (2016). How long does treatment with fixed orthodontic appliances last? A systematic review. American journal of orthodontics and dentofacial orthopedics, 149(3), pp. 308-318. Elsevier 10.1016/j.ajodo.2015.09.020