Sublabial, transseptal, transsphenoidal approach to the pituitary region guided by the ACUSTAR I system. - Burkey BB; Speyer MT; Maciunas RJ; Fitzpatrick JM; Galloway RL Jr; Allen GS (Otolaryngology--head and neck surgery : official journal of American Academy of Otolaryngology-Head and Neck Surgery, 1998)