Free-hand technique of C7 pedicle screw insertion using a simply defined entry point without fluoroscopic guidance for cervical spondylotic myelopathy patients with C3 to C6 instru... oleh Jun Jiang, Chen-yu Song, Zheng-zheng Wu, Zuo-zhi Xie, Bo Shi, Tao Xu, Han Wang, Yong Qiu, Bin Wang, Ze-zhang Zhu, Yang Yu