Quality Requirements for Ultrasound Examination in Early Pregnancy (DEGUM Level I) between 4+0 and 13+6 Weeks of Gestation - Rempen, A.; Chaoui, R.; Häusler, M.; Kagan, K.-O.; Kozlowski, P.; von Kaisenberg, C.; Wisser, J. (Ultraschall in der Medizin - European Journal of Ultrasound, 2016)
Keywords: first trimester; gestational age; normal pregnancy; abnormal pregnancy