DOI:
10.1055/s-00000020
Geburtshilfe und Frauenheilkunde
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References
European Federation of Societies for Ultrasound in Medicine and Biology (EFSUMB).
Safety Statement: EFSUMB Statement on the safe use of doppler ultrasound at 11-14 weeks (or earlier in pregnancy).
2018 Online (Stand: 09.07.2020):
https://www.efsumb.org/blog/archives/25972
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