Nguyễn , N. H. M. T.; Hồ , T. T. T.; Nguyễn , T. H. Q.; Thân , H. N. T. EVALUATING SLEEP QUALITY AMONG ELDERLY AT TWO CARDIOLOGY OUTPATIENT CLINICS OF THONG NHAT HOSPITAL, HO CHI MINH CITY. VMJ 2026, 562.