1. University of Minnesota Medical School, University of Minnesota, Minneapolis, Minnesota;
2. Division of Biostatistics, University of Minnesota, Minneapolis, Minnesota;
3. Department of Surgery, University of Minnesota, Minneapolis, Minnesota;
4. Institute for Health Informatics, University of Minnesota, Minneapolis, Minnesota;
5. Department of Neurological Surgery, Oregon Health and Science University, Portland, Oregon;
6. Department of Neurosurgery, University of Cincinnati, Cincinnati, Ohio;
7. Department of Surgery, University of Michigan Medical School, Ann Arbor, Michigan; and
8. Department of Neurosurgery, Stem Cell Institute, University of Minnesota, Minneapolis, Minnesota