Sulaiman Tahir, Nawab Ali, Ashfaq Ahmad Shah Bukhari, et al. EFFECT OF QRS DURATION ON CARDIAC RESYNCHRONIZATION THERAPY IN PATIENTS WITH HEART FAILURE AND ITS RELATED FACTORS. J Popl Ther Clin Pharmacol. 2023;30(18):638-649. doi:10.53555/jptcp.v30i18.3142