title: Serum cobalamin concentrations during TPN.
mesh_terms: D003424:Crohn Disease / Q000097:blood* / Q000628:therapy; D006801:Humans; D010289:Parenteral Nutrition, Total; D014805:Vitamin B 12 / Q000008:administration & dosage / Q000097:blood*
chemical_list: D014805:Vitamin B 12