FACTORS ASSOCIATED WITH THE SEVERITY OF PNEUMOCOCCAL PNEUMONIA IN CHILDREN AGED FROM 2 MONTHS TO UNDER 5 YEARS AT THE PEDIATRIC CENTER, THAI NGUYEN NATIONAL HOSPITAL, 2024–2025. YHCĐ [Internet]. 2026 Apr. 25 [cited 2026 Sept. 9];67(4). Available from: https://tapchiyhcd.vn/index.php/yhcd/article/view/4899