Sensitivity of Ultrasound in Detecting Spina Bifida
Letter, NEJM 324:769-7721991., , 1991
Diagnosis and Management of Neural-Tube Defects Today
NEJM 324:690-691, Hobbins,J.C., 1991
Ultrasound Screening for Spina Bifida:Cranial & Cerebellar Signs
Lancet 2:72-74, Nicolaides,K.H.,et al, 1986