Comparison of freehand versus navigation-assisted C2 pedicle screw fixation: A retrospective accuracy and safety analysis. - Kiraz, Ilker; Eral, Burak; Sarigul, Buse; Ramazanoglu, Ali Fatih; Haciyakupoglu, Ersin; Coskun, Mehmet Erdal (Journal of Craniovertebral Junction & Spine, 2025)