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Tu, Yu-Kang; Chiu, Yun-Wei; Pandis, Nikolaos (2013). Analyzing longitudinal orthodontic data. Part 1: multilevel linear and curvilinear models. American journal of orthodontics and dentofacial orthopedics, 144(3), pp. 481-6. Elsevier 10.1016/j.ajodo.2013.06.010
