W. Khowaja, S. Akhtar, U. Jiwani, M. Mohsin, F. Shaheen, and S. Ariff, “Outcomes of preterm neonates with patent ductus arteriosus: a retrospective review from a tertiary care hospital”, J Pak Med Assoc, vol. 72, no. 10, pp. 2065–2068, Sep. 2022.