Core outcome set for studies investigating management of selective fetal growth restriction in twins. - Townsend R; Duffy JMN; Sileo F; Perry H; Ganzevoort W; Reed K; Baschat AA; Deprest J; Gratacos E; Hecher K; Lewi L; Lopriore E; et al. (Ultrasound in obstetrics & gynecology : the official journal of the International Society of Ultrasound in Obstetrics and Gynecology, 2020)