1- Holick MF. High prevalence of vitamin D inadequacy and implications for health. Mayo Clin Proc 2006; 81: 353-73.

2- Holick M. Vitamin D déficiency. N Engl J Med 2007 ; 357 : 266-79.

3- DeLuca HF. Overview of general physiologic features and functions of vitaminD. Am J Clin Nutr. 2004;80(suppl 1):1689S–1696S.

4- Lips P. Vitamin D deficiency and secondary hyperparathyroidism in the elderly: consequences for bone loss and fractures and therapeutic implications. Endocr Rev. 2001;22:477–501;