Govindaraj, S., Santhakumaran, P. and Thirumalaikumarasamy, S. (2017) “Evaluation of persistent pneumonia and percutaneous needle aspiration of lung as a tool in the etiological evaluation of children with persistent pneumonia”, International Journal of Contemporary Pediatrics, 4(5), pp. 1694–1700. doi: 10.18203/2349-3291.ijcp20173768.