1. Department of Neurosurgery, S.G.R.R. Institute of Medical & Health Sciences, Dehradun, Uttarakhand, India;
2. Department of Gynecology and Obstetrics, S.G.R.R. Institute of Medical & Health Sciences, Dehradun, Uttarakhand, India;
3. Department of Biostatistics and Health Informatics, Sanjay Gandhi Postgraduate Institute of Medical Sciences, Lucknow, India;
4. Department of Radiology, University of Pennsylvania, Philadelphia, Pennsylvania, USA