title: Thyroid function assay using the effective thyroxine ratio (ETR) in infancy.
mesh_terms: D000367:Age Factors; D001724:Birth Weight; D005865:Gestational Age; D006801:Humans; D007223:Infant; D007231:Infant, Newborn; D007234:Infant, Premature; D008722:Methods; D013960:Thyroid Function Tests; D013961:Thyroid Gland / Q000502:physiology*; D013974:Thyroxine / Q000097:blood*; D013997:Time Factors
chemical_list: D013974:Thyroxine