Hall, W., Sparks, A. A., & Aris, R. (2010). Vitamin D Deficiency in Cystic Fibrosis. International Journal of Endocrinology, 2010(), 41-49. https://doi.org/10.1155/2010/218691
Gielen, E., Boonen, S., Vanderschueren, D., Sinnesael, M., Verstuyf, A., Claessens, F., Milisen, K., & Verschueren, S. (2011). Calcium and Vitamin D Supplementation in Men. Journal of Osteoporosis, 2011(), 309-314. https://doi.org/10.4061/2011/875249
Xie, Z. J., Santora, A. C., Shapses, S. A., & Wang, X. B. (2014). Vitamin D Binding Protein and Vitamin D Levels. International Journal of Endocrinology, 2014(), 349-350-139. https://doi.org/10.1155/2014/638263