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