Reconstruction after retrosigmoid approaches using autologous fat graft-assisted Medpor Titan cranioplasty: assessment of postoperative cerebrospinal fluid leaks and headaches in 60 cases - Ling, P Y; Mendelson, Z S; Reddy, R K; Jyung, R W; Liu, J K (Acta Neurochir (Wien), 2014)