VALIDATION OF THE LC-MS/MS METHOD FOR 25-HYDROXYVITAMIN D DETERMINATION IN CHILDREN’S SERUM ACCORDING TO VDSP STANDARDS. Довкілля та здоров’я [Internet]. 2026 Jul. 15 [cited 2026 Jul. 7];119(2). Available from: https://dovkil-zdorov.kiev.ua/journal/article/view/1247