1. Department of Radiology, Washington University in St. Louis, St. Louis, MO, USA
2. Department of Neurology, Washington University in St. Louis, St. Louis, MO, USA
3. Department of Radiology, Washington University in St. Louis, St. Louis, MO, USA/School of Medicine, St. George’s University, St. George, Grenada
4. Department of Radiology, Washington University in St. Louis, St. Louis, MO, USA/Department of Neurology, Washington University in St. Louis, St. Louis, MO, USA