Retrospective validation of ultrasound characteristics at 19–24 weeks as predictive tools for selective intrauterine growth restriction in monochorionic diamniotic twin pregnancies: a diagnostic study - Zhu, Yin-Di; Wang, Ming-Yue; Pan, Mei-Fang; Bian, Jin-Yan; Chen, You-Guo; Gu, Xin-Xian (Annals of Translational Medicine, 2022)