Effects of frequent ultrasound during pregnancy von James, David, Twining, Peter, Whittle, MartinJ, Zimmermann, Roland, Hebisch, Gundula, Huch, Renate, Huch, Albert, Visser, G.H.A., de Vries, J.I.P., Mulder, Ejh, Ververs, IaP, van Geijn, H.P., Newnham, JohnP, Evans, SharonF, Michael, ConA, Stanley, FionaJ, Landau, LouisI

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