Speckle Tracking in Fetal Echocardiography—Generation of Reference Values of Global Longitudinal Strain for Quantification of Atrial, Ventricular, and Biventricular Fetal Heart Function - Meister, M.; Graupner, O.; Götte, M.; Wolter, A.; Müller, V.; Herrmann, J.; Axt-Fliedner, R.; Enzensberger, C. (The Thoracic and Cardiovascular Surgeon, 2019)