1. Department of Neuropathology, University of Glasgow Medical Faculty, Institute of Neurological Sciences, Southern General Hospital, Glasgow, Scotland, United Kingdom.
2. Department of Neurosurgery, University of Glasgow Medical Faculty, Institute of Neurological Sciences, Southern General Hospital, Glasgow, Scotland, United Kingdom.
3. University of Glasgow, School of Medicine, Gardiner Institute, Western Infirmary, Glasgow, Scotland, United Kingdom.
4. Department of Neurosurgery, Medical College Wisconsin, Milwaukee, Wisconsin.