The Fetal Medicine Foundation (FMF) Germany after 20 Years – Quality Assurance of Ultrasound Examinations during First Trimester Screening - Merz, E.; Thode, Ch.; Hackelöer, B. J.; Eiben, B.; Faber, R.; Tercanli, S.; Huda, E.; Wellek, S. (Ultraschall in der Medizin - European Journal of Ultrasound, 2022)