Muduli, J. K. ., Mitra, M., Banerjee, A., & Paul, A. (2022). Role of Sildenafil in Severe COVID-19 Pneumonia in Infancy - A Case Series. Journal of Nepal Paediatric Society, 42(1), 140–143. https://doi.org/10.3126/jnps.v42i1.41095