title: Letter: Seasonal variations in urinary excretion of calcium.
mesh_terms: D000328:Adult; D002118:Calcium / Q000652:urine*; D002940:Circadian Rhythm; D003404:Creatinine / Q000652:urine; D004032:Diet; D005260:Female; D005919:Glomerular Filtration Rate; D006801:Humans; D006887:Hydroxycholecalciferols / Q000097:blood; D008297:Male; D008875:Middle Aged; D010507:Periodicity; D012621:Seasons
chemical_list: D006887:Hydroxycholecalciferols; D003404:Creatinine; D002118:Calcium