Letter: Standardisation of alpha-fetoprotein assays.
D005260:Female; D005326:Fetal Proteins / Q000032:analysis*; D006801:Humans; D011247:Pregnancy; D011296:Prenatal Diagnosis; D011863:Radioimmunoassay / Q000592:standards; D006113:United Kingdom; D000509:alpha-Fetoproteins / Q000032:analysis*
D005326:Fetal Proteins; D000509:alpha-Fetoproteins