1. Department of Anaesthesia and Pain Medicine, KPC Medical College and Hospital, Kolkata, West Bengal, India
2. Department of Public Health, Kalyani ESI Hospital, Kalyani, West Bengal, India
3. Department of Anaesthesia, Raigunj Medical College, Raiganj, West Bengal, India
4. Department of Anaesthesia, R G Kar Medical College, Kolkata, West Bengal, India