1. Assistant Professor, Dept of anesthesiology, College of medicine & JNM hospital.
2. SR Department of Anesthesiology, Bankura Sammilani Medical college and Hospital, West Bengal.
3. Senior Resident, Department of Neurosurgery, PGIMER, CHANDIGARH.
4. Institute of Post-Graduate Medical Education and Research, A.J.C. Bose Road, Kolkata, West Bengal, India-700020.