1. Division of Neurosurgery, Department of Surgery, Federal Medical Center, Owo, Ondo State;
2. Department of Neurological Surgery, University College Hospital, Ibadan, Oyo State;
3. Division of Neurological Surgery, Department of Surgery, College of Medicine, University of Ibadan, Oyo State; and
4. Department of Accident and Emergency, Federal Medical Center, Owo, Ondo State, Nigeria