4. ULTRASONOGRAPHY CHARACTERISTICS OF 54 PATIENTS UNDER 4 MONTHS OLD SUSPECTED OF BILIARY ATRESIA AND UNDERWENT OPERATION AT THE NATIONAL HOSPITAL OF PEDIATRIC. YHCĐ [Internet]. 2023 Aug. 23 [cited 2026 Sept. 9];64(5). Available from: https://tapchiyhcd.vn/index.php/yhcd/article/view/760