Sofia, Sefri N., Udin Bahrudin, Ilham Uddin, Muhammad A. Sobirin, Erna Setiawati, Galuh Hardiningsih, Kevin C. Tjandra, and Edward KS. Limijadi. “Role of Phosphodiesterase-3 Inhibitor in Cardiorespiratory Fitness and Functional Class of Patients With Pulmonary Hypertension: A Randomized, Double-Blind, Placebo-Controlled Trial”. Narra J 5, no. 1 (January 30, 2025): e1301. Accessed August 11, 2025. https://narraj.org/main/article/view/1301.