1. Department of Neurosurgery and
2. Department of Neurological Surgery, Oregon Health & Science University, Portland, Oregon
3. Campbell University School of Osteopathic Medicine, Buies Creek, North Carolina and
4. University of North Carolina School of Medicine and
5. Division of Neuroradiology, Department of Radiology,
6. Biomedical Research Imaging Center, University of North Carolina, Chapel Hill;