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A unified protocol is essential to ensure that fetal ultrasound measurements taken in multicentre research studies are accurate and reproducible. This paper describes the methodology used to take two-dimensional, ultrasound measurements in the longitudinal, fetal growth component of the INTERGROWTH-21st Project. These standardised methods should minimise the systematic errors associated with pooling data from different sites. They represent a model for carrying out similar research studies in the future.
http://onlinelibrary.wiley.com/doi/10.1111/1471-0528.12313/abstract