1. Neuroanaesthesia Division, Department of Anaesthesiology, Sree Chitra Tirunal Institute for Medical Sciences and Technology, Trivandrum, Kerala, India
2. Department of Anaesthesiology, Christian Medical College, Vellore, Tamil Nadu, India
3. Department of Neurology, Sree Chitra Tirunal Institute for Medical Sciences and Technology, Trivandrum, Kerala, India