OP20.02: Human embryonic head growth trajectories and maternal peri‐conception characteristics using three dimensional ultrasound and virtual reality. (1st October 2015) - Koning, I.V.; Baken, L.; Groenenberg, I.; Husen, S.; Gijtenbeek, M.; Willemsen, S.; Koning, A.; Dudink, J.; Reiss, I.; Steegers, E.A.; Steegers‐Theunissen, R.P.