1Department of Pediatric Surgery, Dr. B. C. Roy Post Graduate Institute of Pediatric Sciences, Kolkata, West Bengal, India; 2Department of Pediatric Surgery, R. G. Kar Medical College, Kolkata, West Bengal, India; 3Department of General Surgery, R. G. Kar Medical College, Kolkata, West Bengal, India; 4Department of Pediatric Medicine, R. G. Kar Medical College, Kolkata, West Bengal, India