Accuracy of C2 pedicle screw placement using the anatomic freehand technique. - Bydon, Mohamad; Mathios, Dimitrios; Macki, Mohamed; De la Garza-Ramos, Rafael; Aygun, Nafi; Sciubba, Daniel M.; Witham, Timothy F.; Gokaslan, Ziya L.; Bydon, Ali; Wolinksy, Jean-Paul (Clinical Neurology & Neurosurgery, 2014)