J. Abubaker, A. S. Shaikh, M. Hassan, A. Ammar, U. Tauseef, and M. S. Arif, “National Institute Pulmonary Hypertension Registry (NIPHeR): Insights from the first pulmonary hypertension registry of Pakistan”, J Pak Med Assoc, vol. 75, no. 07, pp. 1058–1066, Jul. 2025.