Fetal Weight Estimation by Ultrasound: Comparison of 11 Different Formulae and Examiners with Differing Skill Levels - Siemer, J; Egger, N; Hart, N; Meurer, B; Müller, A; Dathe, O; Goecke, T; Schild, R L (Ultraschall in der Medizin - European Journal of Ultrasound, 2008)