“37. VITAMIN D DEFICIENCY IN CHILDREN AGED UNDER 6 IN NGHE AN OBSTETRICS AND PEDIATRICS HOSPITAL IN 2023” (2025) Vietnam Journal of Community Medicine, 66(CĐ6-HNKH Bệnh viện Sản nhi Nghệ An). doi:10.52163/yhc.v66iCD6.2303.