Development and evaluation of a “simulator-based” ultrasound training program for university teaching in obstetrics and gynecology–the prospective GynSim study oleh Johannes Weimer, Florian Recker, Annette Hasenburg, Holger Buggenhagen, Karla Karbach, Lia Beer, Andreas Weimer, Lina Schiestl, Liv Lorenz, Roman Kloeckner, Anna Dionysopoulou