title: Letter: Accuracy and standardisation of serum thyroxine assays.
mesh_terms: D001667:Binding, Competitive; D002624:Chemistry, Clinical / Q000592:standards; D002845:Chromatography; D006801:Humans; D007457:Iodine Radioisotopes; D008722:Methods; D011485:Protein Binding; D013974:Thyroxine / Q000097:blood*
chemical_list: D007457:Iodine Radioisotopes; D013974:Thyroxine