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Obstetrics and Gynecology|January 1, 1978
Comparison of fetal maturity evaluation with ultrasonic biparietal diameter and amniotic fluid lecithin-sphingomyelin ratioW N Spellacy, S R Gelman, S D Wood, et al.
American Journal of Obstetrics and Gynecology|July 1, 1979
Assessment of fetal lung maturity: a comparison of the lecithin/sphingomyelin ratio and the tests of optical density at 400 and 650 nmW N Spellacy, W C Buhi, A C Cruz, et al.
American Journal of Obstetrics and Gynecology|December 1, 1979
Oxytocin challenge test results compared with simultaneously studied serum human placental lactogen and free estriol levels in high-risk pregnant womenW N Spellacy, A C Cruz, P S Kalra, et al.
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