Letter: Ultrasound in diagnosis of spina bifida.
D000649:Amniocentesis; D000653:Amniotic Fluid / Q000032:analysis; D005260:Female; D006801:Humans; D011247:Pregnancy; D011296:Prenatal Diagnosis; D016135:Spinal Dysraphism / Q000175:diagnosis*; D014463:Ultrasonography; D000509:alpha-Fetoproteins / Q000032:analysis
D000509:alpha-Fetoproteins