Thanh, Ngo Van, Pham Truong Son, and Nguyen Quang Tuan. “Outcome of Patients With Normal and Decreased Heart Rate Variability Coronary Artery Bypass Grafting Surgey”. The Vietnam Journal of Cardiovascular and Thoracic Surgery 35 (January 6, 2022): 115-123. Accessed February 12, 2026. https://vjcts.vn/index.php/vjcts/article/view/688.