title: Systematic reviews of trials of umbilical artery Doppler: time for more primary research.
authors: Academic Unit of Paediatrics, Obstetrics and Gynaecology, University of Leeds, D Floor, Clarendon Wing, Leeds General Infirmary, Belmont Grove, Leeds, LS2 9NS UK.
authors: J
authors: J
authors: Thornton
mesh_terms: D002986:Clinical Trials as Topic; D019317:Evidence-Based Medicine; D005260:Female; D006801:Humans; D011247:Pregnancy; D018566:Pregnancy, High-Risk; D012106:Research; D012196:Review Literature as Topic; D018608:Ultrasonography, Doppler; D016216:Ultrasonography, Prenatal / Q000379:methods*; D014469:Umbilical Arteries / Q000000981:diagnostic imaging*; D006113:United Kingdom