Is simulation training only for inexperienced trainees? A multicenter randomized trial exploring the effects of simulation-based ultrasound training on obstetricians’ diagnostic accuracy - Andreasen, L A; Tabor, A; Norgaard, L N (Ultrasound in obstetrics & gynecology: the official journal of the International Society of Ultrasound in Obstetrics and Gynecology, 2019)