PubMed:: "Receptors, Calcitriol"[Mesh] OR "calcitriol receptor"[tiab] OR "calcitriol receptors"[tiab] OR "vitamin d receptor"[tiab] OR "vitamin d receptors"[tiab] OR vdr[tiab] OR "vitamin d3 receptor"[tiab] OR "vitamin d3 receptors"[tiab];; Embase.com:: 'calcitriol receptor'/exp OR 'vitamin D receptor'/exp OR 'Calcitriol Receptor':ti,ab OR 'Calcitriol Receptors':ti,ab OR 'vitamin D receptor':ti,ab OR 'vitamin D receptors':ti,ab OR VDR:ti,ab OR 'Vitamin D3 Receptor':ti,ab OR 'Vitamin D3 Receptors':ti,ab;; Cochrane Library:: "Calcitriol Receptor" OR "Calcitriol Receptors" OR "vitamin D receptor" OR "vitamin D receptors" OR VDR OR "Vitamin D3 Receptor" OR "Vitamin D3 Receptors"