1. Department of Neurosurgery, Faculty of Medicine, Cairo University, Cairo, Egypt;
2. Department of Neurological Surgery, Indiana University School of Medicine, Indianapolis, Indiana;
3. Department of Neurosurgery, Hospital General Universitario de Alicante, Miguel Hernandez University, Alicante, Spain; and
4. Department of Neurosurgery, Schulich School of Medicine and Density, Western University, Windsor, Ontario, Canada