[1] Upendra Devkota Mem Natl Inst Neurol & Allied Sci, Neuroimaging & Intervent Radiol, Kathmandu, Nepal
[2] Natl Neuro Ctr, Neurol, Kathmandu, Nepal
[3] All india Inst Med Sci, Dept Neurol, New Delhi, Delhi, India
[4] AIIMS Bhubaneswar, Radiodiagnosis, Bhubaneswar, Orissa, India