1. Department of Radiodiagnosis, All India Institute of Medical Sciences , Patna 801507, India
2. Department of Radiodiagnosis, SGPGIMS , Lucknow 226014, India
3. Department of Neurology, SGPGIMS , Lucknow 226014, India
4. Department of Pathology, SGPGIMS , Lucknow 226014, India
5. Department of Radiology, Medanta Super Speciality Hospital , Lucknow 226030, India