VDR and vitamin D deficiency: A survey conducted by Hossein-Nezhad et al. (2014) determined that vitamin D deficiency correlated with the VDR FokI polymorphism in 760 Iranian patients who had undergone angiography due to suspected coronary artery disease (CAD), as vitamin D deficiency that is more prevalent in CAD patients might be result from FokI polymorphism [90].