Effect of sildenafil on maternal hemodynamics in pregnancies complicated by severe early-onset fetal growth restriction: planned subgroup analysis from a multicenter randomized placebo-controlled double-blind trial. - Khalil, A.; Sharp, A.; Cornforth, C.; Jackson, R.; Mousa, H.; Stock, S.; Harrold, J.; Turner, M. A.; Kenny, L. C.; Baker, P. N.; Johnstone, E. D.; Von Dadelszen, P.; et al. (Ultrasound in Obstetrics & Gynecology, 2020)