1. Department of Neurology University of Utah School of Medicine Salt Lake City UT USA
2. Division of Headache and Neuro‐Ophthalmology University of Utah School of Medicine Salt Lake City UT USA
3. Division of Diagnostic and Clinical Neurology University of Utah School of Medicine Salt Lake City UT USA
4. Department of Anesthesiology University of Utah School of Medicine Salt Lake City UT USA
5. Division of Neuroradiology Imaging University of Utah School of Medicine Salt Lake City UT USA
6. Department of Radiology University of Utah School of Medicine Salt Lake City UT USA