title: Secondary hyperparathyroidism in the elderly: means to defining hypovitaminosis D.
authors: Metabolism Laboratory, St Vincent's Hospital, Dublin, Ireland. mjmckenn@iol.ie
authors: M J
authors: MJ
authors: McKenna
authors: R
authors: R
authors: Freaney
mesh_terms: D000328:Adult; D000368:Aged; D005260:Female; D006801:Humans; D006962:Hyperparathyroidism, Secondary / Q000097:blood / Q000209:etiology*; D008297:Male; D008875:Middle Aged; D010281:Parathyroid Hormone / Q000097:blood; D012016:Reference Values; D014807:Vitamin D / Q000031:analogs & derivatives / Q000097:blood; D014808:Vitamin D Deficiency / Q000097:blood / Q000150:complications*
chemical_list: D010281:Parathyroid Hormone; D014807:Vitamin D; C104450:25-hydroxyvitamin D