Rizka Maulidia, Zulfikri Mukhtar, T. Bob Haykal, Harris Hasan, Ali N Nasution, Hilfan A.P. Lubis, “QRS COMPLEX FRAGMENTATION AS A PREDICTOR OF MORTALITY AND REHOSPITALISATION IN THE FIRST 6 MONTHS IN ACUTE CORONARY SYNDROME IN HAJI ADAM MALIK GENERAL HOSPITAL, MEDAN”, IJRSM, vol. 8, no. 10, pp. 36–44, Oct. 2021.