Speculum-Assisted Endoscopic Transnasal Transsphenoidal Approach to the Skull Base: A Technical Note with Case Illustration - Marotta, Dario A.; Farr, Saman; Podkovik, Stacey; Bowen, Ira; Brazdzionis, James; Duong, Jason; Sweiss, Raed (Journal of Neurological Surgery Part B: Skull Base, 2022)