Govindaraj, Srinivasan, Perumalpillai Santhakumaran, and Sivaraman Thirumalaikumarasamy. 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):1694-1700. https://doi.org/10.18203/2349-3291.ijcp20173768.