Enhanced biomechanical stability of two-screw technique in ventral screw osteosynthesis of the dens axis: Evidence from fatigue data and camera analysis - P.J. Roch; E. Salge; M.A. Bravo-Cabrera; F.S. Klockner; M.P. Meier; K. Jäckle; W. Lehmann; L. Weiser (Brain and Spine)