The searches yielded citations

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All women were followed up throughout pregnancy until delivery and hospital discharge. Conclusions We have produced international prescriptive standards for early fetal linear size and ultrasound dating of pregnancy in the first trimester that can be used throughout the world. Cases of neonatal and fetal death, severe pregnancy complications and congenital abnormalities were excluded from the study. The searches yielded citations. The highest potential for bias was noted in inclusion and exclusion criteria, and in maternal demographic characteristics.

All women were followedConclusions We have produced