1. Division of Neurological Surgery, Department of Surgery, College of Medicine, University of Ibadan, Ibadan, Nigeria
2. Department of Ophthalmology, College of Medicine, University of Ibadan, Ibadan, Nigeria
3. Department of Pathology, College of Medicine, University of Ibadan, Ibadan, Nigeria
4. Division of Neurological Surgery, Department of Surgery, College of Medicine, University of Ibadan, Ibadan, PMB 5112, Ibadan, Oyo Sate, Nigeria