Guidelines for the management of severe traumatic brain injury. VI. Indications for intracranial pressure monitoring - Bratton, S L; Chestnut, R M; Ghajar, J; Brain Trauma Foundation; American Association of Neurological Surgeons; Congress of Neurological Surgeons; Joint Section on Neurotrauma and Critical Care, AANS/CNS (J Neurotrauma, 2007)