Optimal Metric of Surgical Freedom: Volume of Surgical Freedom Compared with Other Metrics of Instrument Maneuverability - Houlihan, Lena Mary; Naughton, David; Loymak, Thanapong; Abramov, Irakliy; Knoll, Ann J. Staudinger; Pevey, Ryan S.; Labib, Mohamed A.; O'Sullivan, Michael G. J.; Lawton, Michael T.; Preul, Mark C. (Journal of Neurological Surgery Part B: Skull Base, 2022)