1. Bischoff-Ferrari HA, et al. 2005. Fracture prevention with vitamin D supplementation: a meta-analysis of randomized controlled trials. Journal of the American medical association. 293 (18): 2257-2264.
2. Chowdhury R, et al. 2014. Vitamin D and risk of cause specific death: systematic review and meta-analysis of observational cohort and randomised intervention studies. British medical journal 348: g1903.
3. Christodoulou S, Goula T, Ververidis A & Drosos G 2013. Vitamin D and bone disease. BioMed research international. 2013: 396541.
4. Chung M, Lee J, Terasawa T, Lau J & Trikalinos TA 2011. Vitamin D with or without calcium supplementation for prevention of cancer and fractures: an updated meta-analysis for the US Preventive Services Task Force. Annals of internal medicine. 155 (12): 827-838.
5. DeLuca HF 2004. Overview of general physiologic features and functions of vitamin D. The American journal of clinical nutrition. 80 (6): 1689S-1696S.
6. Gaugris S, et al. 2005. Vitamin D inadequacy among post-menopausal women: a systematic review. Monthly journal of the association of physicians. 98 (9): 667-676.
7. Grant WB, Schwalfenberg GK, Genuis SJ & Whiting SJ 2010. An estimate of the economic burden and premature deaths due to vitamin D deficiency in Canada. Molecular nutrition & food research. 54 (8): 1172-1181.
8. Heshmat R, et al. 2008. Vitamin D deficiency in Iran: A multi-center study among different urban areas. Iran journal public health. 37 (suppl).
9. Hilger J, et al. 2014. A systematic review of vitamin D status in populations worldwide. British journal of nutrition. 111 (01): 23-45.
10. Holick MF, et al. 2011. Evaluation, treatment, and prevention of vitamin D deficiency: an Endocrine Society clinical practice guideline. The Journal of clinical endocrinology & metabolism. 96 (7): 1911-1930.
11. Jolfaie NR, Rouhani MH, Onvani S & Azadbakht L 2016. The association between Vitamin D and health outcomes in women: A review on the related evidence. Journal of research in medical sciences: The official journal of Isfahan University of medical sciences. 21: 76.
12. Kathleen Mahan L, Escott-Stump S, Raymond Janice L & Krause MV 2012. Krause's Food & the Nutrition Care Process. Elsevier health sciences.
13. Kennel KA, Drake MT & Hurley DL 2010. Vitamin D deficiency in adults: when to test and how to treat. In mayo clinic proceedings. 85(8): 752-758. Elsevier.
14. Khadilkar VV & Khadilkar AV 2013. Use of vitamin D in various disorders. The Indian journal of pediatrics. 80 (3): 215-218.
15. Mehrdad S, Zahra N, Hassan LM & Ahmad S 2009. Prevalence of vitamin D deficiency among female students in secondary guidance school in Yazd City. Acta medica Iranica. 47 (3): 209-214.
16. Moher D, Schulz KF, Altman D & Group C 2001. The CONSORT statement: revised recommendations for improving the quality of reports of parallel-group randomized trials. Journal of the American medical association. 285 (15): 1987-1991.
17. Moradzadeh K, et al. 2008. Normative values of vitamin D among Iranian population: a population based study. International journal of osteoporosis & metabolic disorders. 1 (1): 8-15.
18. Norman AW 2008. A vitamin D nutritional cornucopia: new insights concerning the serum 25-hydroxyvitamin D status of the US population. The American journal of clinical nutrition. 88 (6): 1455-1456.
19. Schöttker B, et al. 2014. Vitamin D and mortality: meta-analysis of individual participant data from a large consortium of cohort studies from Europe and the United States. British medical journal 348: g3656.
20. Shakiba M & Rafiei P 2009. Prevalence of vitamin D deficiency among medical staff in Shahid Sadoughi Hospital in Yazd, Iran. British medical journal. 7 (25): 22-30.
21. Shao T, Klein P & Grossbard ML 2012. Vitamin D and breast cancer. The oncologist. 17 (1): 36-45.
22. Tang BM, Eslick GD, Nowson C, Smith C & Bensoussan A 2007. Use of calcium or calcium in combination with vitamin D supplementation to prevent fractures and bone loss in people aged 50 years and older: a meta-analysis. The lancet. 370 (9588): 657-666.