Putra, M., I. Arso, I. Puspitawati, and A. Hartopo. “Serum Endothelin-1 Level >2.0 Pg/ML Associates With High-Risk Duke Treadmill Score Among Chronic Coronary Syndrome Patients”. Indonesian Journal of Cardiology, Vol. 47, no. 3, June 2026, pp. 272-8, doi:10.30701/ijc.1907.