1. From the Department of Internal Medicine, An-Najah National University Hospital, Nablus, Palestine
2. Department of Medicine, Faculty of Medicine and Health Sciences, An-Najah National University, Nablus, Palestine
3. Neuro-Oncology Department, Columbia University, Irving Medical Center, New York, NY
4. Columbia University, Irving Medical Center, New York, NY
5. Department of Medicine, Hebron University, College of Medicine, Hebron, Palestine.