Arshad, Muhammad Sohail, Mudasser Adnan, Hafiz Muhammad Anwar-ul-Haq, and Arif Zulqarnain. 2021. “Postnatal Causes and Severity of persistent pulmonary Hypertension of Newborn”. Pakistan Journal of Medical Sciences 37 (5). https://doi.org/10.12669/pjms.37.5.2218.