Parathyroid hormone and 25-hydroxyvitamin D concentrations in the elderly.
D015652:25-Hydroxyvitamin D 2; D000368:Aged; D003404:Creatinine / Q000097:blood; D004872:Ergocalciferols / Q000031:analogs & derivatives* / Q000097:blood; D006801:Humans; D010281:Parathyroid Hormone / Q000097:blood*
D004872:Ergocalciferols; D010281:Parathyroid Hormone; D015652:25-Hydroxyvitamin D 2; D003404:Creatinine