CHANGES IN SERUM 25 – HYDROXYVITAMIN D [25(OH)D] LEVELS FOLLOWING TREATMENTFOR VITAMIN D DEFICIENCY IN PREGNANT WOMEN AT HAI PHONG OBSTETRICS AND GYNECOLOGY HOSPITAL, FROM 2024 TO 2025. YHCĐ. 2026;67(CD14). doi:10.52163/yhc.v67iCD14.6458