1. Department of Radiology, Division of Neuroradiology, University of Pennsylvania; Philadelphia, PA, USA
2. Department of Neurology, Medical University of Silesia; Katowice, Poland
3. Department of Neurology, Hospital of the University of Pennsylvania; Philadelphia, PA, USA
4. Department of Nuclear Medicine, Medical University of Gdansk; Gdansk, Poland
5. Al-Imam Muhammad Ibn Saud Islamic University; Riyadh, Saudi Arabia