Muduli JK, Mitra M, Banerjee A, Paul A. Role of Sildenafil in Severe COVID-19 Pneumonia in Infancy - A Case Series. J. Nepal Paedtr. Soc. [Internet]. 2022 Nov. 27 [cited 2024 Nov. 22];42(1):140-3. Available from: https://nepjol.info/index.php/JNPS/article/view/41095