1. Department of Neuroanaesthesia, Institute of Neurosciences Kolkata, West Bengal, India
2. Department of Anaesthesiology, Critical Care and Pain Medicine, All India Institute of Medical Sciences, Guwahati, Assam, India
3. Department of Anaesthesiology, Medica Superspeciality Hospital, Kolkata, West Bengal, India
4. Department of Neurosurgery, Medica Superspecialty Hospital, Kolkata, West Bengal, India,