Edra, Alven, Adrianison Syamsu, and Dyah Siswanti. 2025. “Severity of Obstruction Associated With Pulmonary Hypertension in COPD Patients at Arifin Achmad General Hospital: What Factors Influence? ”. Respiratory Science 5 (3):185-97. https://doi.org/10.36497/respirsci.v5i3.173.