Morphometric Trajectory Analysis for Occipital Condyle Screws oleh Yu‐kun Du, Si‐yuan Li, Wen‐jiu Yang, Xiang‐yang Wang, Yi‐fang Bi, Jun Dong, Hui Huang, Feng Gao, Gui‐zhi Li, Hua‐wei Wei, Jian‐kun Yang, Yong‐ming Xi