20. CHANGES IN PLASMA MATRIX METALLOPROTEINASE-9 CONCENTRATIONS IN PATIENTS WITH CHRONIC OBSTRUCTIVE PULMONARY DISEASE IN AND OUT OF EXACERBATION AT MILITARY HOSPITAL 103 IN 2023. YHCĐ [Internet]. 2024 May 15 [cited 2026 Sept. 8];65(CĐ 3 - Bệnh viện Phổi Trung ương). Available from: https://tapchiyhcd.vn/index.php/yhcd/article/view/1116