EP01.02: Correlation between the sonographic measurement of the occiput spine angle and the fetal head station in the 1st stage of labour. (1st October 2015) - Ghi, T.; Franchi, L.; Mazzone, E.; Krsmanovic, J.; Azzarone, C.; Bellussi, F.; Azzerboni, A.; Youssef, A.; Rizzo, N.; Pilu, G.; Frusca, T.