口外颈牵引装置早期矫治安氏Ⅱ类1分类错(牙合)的疗效研究
구외경견인장치조기교치안씨Ⅱ류1분류착(아합)적료효연구
A Study on the Effects of Early Treatment with Extraoral Cervical Traction on Class Ⅱ Division 1 Malocclusions
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