Third trimester placental grading by ultrasonography as a test of fetal wellbeing:Br Med J (Clin Res Ed) 1987; 295 doi: https://doi.org/10.1136/bmj.295.6596.502-c (Published 22 August 1987) Cite this as: Br Med J (Clin Res Ed) 1987;295:502
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