Role of Bone Graft in Reconstruction of Skull Base Defect: Is a Bone Graft Necessary - Yamamoto, Yuhei; Minakawa, Hidehiko; Yoshida, Tetsunori; Igawa, Hiroharu; Sugihara, Tsuneki; Ohura, Takehiko; Nohira, Kunihiko (Skull Base Surgery, 1993)