“37. VITAMIN D DEFICIENCY IN CHILDREN AGED UNDER 6 IN NGHE AN OBSTETRICS AND PEDIATRICS HOSPITAL IN 2023”. Vietnam Journal of Community Medicine, vol. 66, no. CĐ6-HNKH Bệnh viện Sản nhi Nghệ An, May 2025, https://doi.org/10.52163/yhc.v66iCD6.2303.