1. Department of Neurosurgery, Southmead Hospital, North Bristol NHS Trust, Bristol, United Kingdom
2. Dean’s Clinical Research Program, Aga Khan University, Aga Khan University Hospital, Karachi, Sindh, Pakistan
3. Aga Khan Medical College, Aga Khan University, Karachi, Sindh, Pakistan
4. Department of Surgery, Aga Khan University, Aga Khan University Hospital, Karachi, Sindh, Pakistan.