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Changes in serum 25(OH)D, calcium and 1,25 (OH) 2D level after vitamin D supplementation. Changes in serum 25(OH)D (A) calcium (B) and 1,25 (OH) 2D (C) level according to the dose of vitamin D supplementation in the six months that preceded the study. There is no significant change in calcium and 1,25 (OH) 2D serum level depending on the total amount of vitamin D supplementation.
