1. Neurology Section, Department of Internal Medicine, Aga Khan University, Dar es Salaam, Tanzania.
2. Clinical Neurophysiology Laboratory, Aga Khan Hospital, Dar es Salaam, Tanzania.
3. Neurosurgery Section, Department of Surgery, Aga Khan University, Dar es Salaam, Tanzania.
4. Neurology Unit, Department of Medicine, University College Hospital, Ibadan, Nigeria.
5. Department of Surgery, Aga Khan University, Dar es Salaam, Tanzania.