1. Department of Pediatrics, North Bengal Medical College, Darjeeling, West Bengal, India
2. Community Medicine, Medical College Kolkata, Kolkata, West Bengal, India
3. Pediatric Medicine, Medical College Kolkata, Kolkata, West Bengal, India
4. Department of Microbiology, West Bengal State University, Barasat, West Bengal, India
5. Department of Pharmacology, IPGMER and SSKM Hospital, Kolkata, West Bengal, India