Letter: Comparison between free thyroxine index and effective thyroxine ratio.
D001774:Blood Chemical Analysis / Q000379:methods; D006801:Humans; D011956:Receptors, Cell Surface; D013974:Thyroxine / Q000097:blood*; D013975:Thyroxine-Binding Proteins
D011956:Receptors, Cell Surface; D013975:Thyroxine-Binding Proteins; D013974:Thyroxine