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Vitamin D Deficiency
Cystic Fibrosis
Transsexualism
Vitamin D
Calcifediol
Cholecalciferol
25-Hydroxyvitamin D 2
Parathyroid Hormone
Ergocalciferols
Calcitriol
Vitamins
25-Hydroxyvitamin D3 1-alpha-Hydroxylase
Cross-Sectional Studies
Prevalence
Seasons
Severity of Illness Index
Dietary Supplements
Sunlight
Double-Blind Method
Young Adult
Co-Publications
20
13
12
4
3
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