title: WFUMB/ISUOG statement on the safe use of Doppler ultrasound during 11-14 week scans (or earlier in pregnancy).
mesh_terms: D005260:Female; D006801:Humans; D011247:Pregnancy; D018608:Ultrasonography, Doppler / Q000379:methods* / Q000592:standards*; D016216:Ultrasonography, Prenatal / Q000379:methods* / Q000592:standards*