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Evaluation of orthodontic treatment in patients with extraction of mandible first molar using PAR index and cephalometrics
Qinglin WANG, Shaoyun HE Yongjian ZHOU, Yongjian HE, Mingyu LI Rongxia MA
Journal of Prevention and Treatment for Stomatological Diseases . 2017, (12): 788 -793 .  DOI: 10.12016/j.issn.2096-1456.2017.12.008