OP19.04: Vacuum extraction failure is associated with a large head circumference rather than high birthweight. - Kabiri, D.; Lipschuetz, M.; Cohen, S.M.; Yagel, O.; Levitt, L.; Herzberg, S.; Ezra, Y.; Amsalem, H.; Yagel, S. (Ultrasound in Obstetrics & Gynecology, 2017)