1. Departemnt of Neurosurgery, Hannover Medical School, Hannover, Germany
2. Department of Neurosurgery, Neurosurgery Clinic, Birgunj, Nepal
3. Departemnt of Neurosurgery, Klinikum Dessau, Dessau-Roßlau, Germany
4. Faculty of Medicine, University of Kufa, Kufa, Iraq
5. Faculty of Medicine, Sumy State University, Sumy, Ukraine
6. Department of Neurosurgery, Derince Research Hospital, Kocaeli, Turkey