title: Letter: Osteoporosis of ageing.
mesh_terms: D000368:Aged; D000375:Aging; D006801:Humans; D006887:Hydroxycholecalciferols / Q000378:metabolism; D008875:Middle Aged; D010024:Osteoporosis / Q000209:etiology*
chemical_list: D006887:Hydroxycholecalciferols