title: Parathyroid-vitamin D axis in critically ill patients with unexplained hypocalcemia.
mesh_terms: D000328:Adult; D000368:Aged; D002112:Calcifediol / Q000097:blood; D002118:Calcium / Q000652:urine; D005260:Female; D006801:Humans; D006996:Hypocalcemia / Q000209:etiology*; D007362:Intensive Care Units; D008297:Male; D008875:Middle Aged; D010281:Parathyroid Hormone / Q000097:blood*; D014807:Vitamin D / Q000378:metabolism*; D014808:Vitamin D Deficiency / Q000150:complications
chemical_list: D010281:Parathyroid Hormone; D014807:Vitamin D; D002112:Calcifediol; D002118:Calcium