Ultrasound appearances of the acrania‐anencephaly sequence at 10 to 14 weeks’ gestation - Wertaschnigg, Dagmar; Reddy, Maya; Ramkrishna, Jayshree; Costa, Fabrício da Silva; Sepulveda, Waldo; Rolnik, Daniel L.; Meagher, Simon (Journal of Ultrasound in Medicine, 2020)