title: Seasonal variations in serum 25-hydroxycholecalciferol in healthy people.
mesh_terms: D000328:Adult; D001800:Blood Specimen Collection; D002118:Calcium / Q000097:blood; D002762:Cholecalciferol / Q000096:biosynthesis; D005260:Female; D006801:Humans; D006887:Hydroxycholecalciferols / Q000097:blood*; D008131:London; D008297:Male; D008875:Middle Aged; D010710:Phosphates / Q000097:blood; D012621:Seasons; D012867:Skin / Q000528:radiation effects; D013472:Sunlight; D014466:Ultraviolet Rays
chemical_list: D006887:Hydroxycholecalciferols; D010710:Phosphates; D002762:Cholecalciferol; D002118:Calcium