21. ASSESSING REDUCTION OF MORTALITY AND POSTOPERATIVE COMPLICATIONS IN ELDERLY PATIENTS TREATED AT NGHE AN HOSPITAL FOR TRAUMATOLOGY AND ORTHOPAEDICS. YHCĐ [Internet]. 2022 Dec. 27 [cited 2026 Sept. 8];64(1). Available from: https://tapchiyhcd.vn/index.php/yhcd/article/view/587