Anatomical Step-by-Step Dissection of Complex Skull Base Approaches for Trainees: Surgical Anatomy of the Retrosigmoid Approach - Graffeo, Christopher S.; Celda, Maria Peris; Perry, Avital; Carlstrom, Lucas P.; Driscoll, Colin L.; Link, Michael J. (Journal of Neurological Surgery Part B: Skull Base, 2020)