1. Department of Neurosurgery, Govind Ballabh Pant Institute of Postgraduate Medical Education and Research, Delhi, India.
2. Department of Radiodiagnosis, Govind Ballabh Pant Institute of Postgraduate Medical Education and Research, Delhi, India.
3. Department of Pathology, Govind Ballabh Pant Institute of Postgraduate Medical Education and Research, Delhi, India.