Lefi, A.; Dewi, I. P.; Dewi, K. P.; Mulia, E. P. B.; Subagjo, A.; Dharmadjati, B. The Role of Contractile Reserve by Stress Test Echocardiography for Predicting Cardiac Resynchronization Therapy Responder: Systematic Review and Meta-Analysis. Open Access Maced J Med Sci 2021, 9, 67-75.