In a meta-analyses of observational studies and randomized controlled trials by Theodoratou, et al, out of 137 diseases linked with vitamin D deficiency (including cardiovascular, autoimmune, infectious, skeletal, malignant, metabolic, and other diseases), ten outcomes were studied and results showed an association of vitamin D deficiency (VDD) with birth weight, childhood dental caries, and parathyroid hormone concentrations in patients suffering from chronic kidney disease [6]. Here, PTH is linked to vitamin D deficiency.