1. Neurosurgical Research Network (NRN), Universal Scientific Education and Research Network (USERN), Tehran, Iran;
2. Department of Neurosurgery, Tehran University of Medical Sciences, Tehran, Iran;
3. Department of Neurosurgery, Mount Sinai Hospital, Icahn School of Medicine, New York City, New York, USA;
4. Department of Neurosurgery, State University of New York at Buffalo, Buffalo, New York, USA;
5. Department of Neurological Surgery, University of Virginia, Charlottesville, Virginia, USA