vitamin D receptor human 6 Article 5 Humans 5 female 5 Female 4 Receptors, Calcitriol 4 VDR protein, human 4 calcitriol receptor 4 case control study 4 controlled study 4 genetics 4 major clinical study 4 male 4 vitamin D 4 Male 3 adult 3 metabolism 3 middle aged 3 single nucleotide polymorphism 3 Case-Control Studies 2 Middle Aged 2 Vitamin D 2 allele 2 blood 2 cancer risk 2 cholesterol 2 comparative study 2 gene 2 genetic variability 2