Dual pitch titanium-coated pedicle screws improve initial and early fixation in a polyetheretherketone rod semi-rigid fixation system in sheep by Wen-Tao Wang, Chi-Hua Guo, Kun Duan, Min-Jie Ma, Yong Jiang, Tuan-Jiang Liu, Ji-Jun Liu, Ding-Jun Hao, Peng Lyu

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