Nguyễn NHMT, Hồ TTT, Nguyễn THQ, Thân HNT. EVALUATING SLEEP QUALITY AMONG ELDERLY AT TWO CARDIOLOGY OUTPATIENT CLINICS OF THONG NHAT HOSPITAL, HO CHI MINH CITY. VMJ [Internet]. 2026 Aug. 13 [cited 2026 Sep. 16];562(3). Available from: https://tapchiyhocvietnam.vn/index.php/vmj/article/view/18469