Filly, R A Fetal spine morphology and maturation during the second trimester. Sonographic evaluation. [electronic resource] - Journal of ultrasound in medicine : official journal of the American Institute of Ultrasound in Medicine Nov 1987 - 631-6 p. digital Publication Type: Journal Article ISSN: 0278-4297 Standard No.: 10.7863/jum.1987.6.11.631 doi Subjects--Topical Terms: FemaleHumansNeural Tube Defects--pathologyOsteogenesisPregnancyPregnancy Trimester, SecondPrenatal DiagnosisSpine--pathologyUltrasonography