Mohammad Khalid Khan, et al. “Prevalence and Clinical Features of Pulmonary Hypertension: A Retrospective Study at Tertiary Care Hospital in Mardan”. Pakistan Journal of Medical Research, vol. 65, no. 2, July 2026, pp. 79-83, https://www.pjmr.org.pk/index.php/pjmr/article/view/1280.