Suboccipital decompression for Chiari I malformation: outcome comparison of duraplasty with expanded polytetrafluoroethylene dural substitute versus pericranial autograft - Attenello, F J; McGirt, M J; Garcés-Ambrossi, G L; Chaichana, K L; Carson, B; Jallo, G I (Childs Nerv Syst, 2009)