Dr. Hemanshu Prabhakar Dr. Hemanshu Prabhakar is Professor in Neuroanaesthesiology and Critical Care, at the All India Institute of Medical Sciences (AIIMS), New Delhi, India. Dr. S. Leve Joseph Devarajan Dr. S. Leve Joseph Devarajan is Associate Professor in Department of Neuroimaging & Interventional Neuroradiology, All India Institute of Medical Sciences (AIIMS), New Delhi, India