OC14.01: Prediction of cephalopelvic disproportion by evaluating the ratio between the head circumference and the obstetric conjugate. Issue Volume 58:Issue S1(2021)Supplement (14th October 2021) - Morganelli, G.; di Pasquo, E.; Dall'Asta, A.; Volpe, N.; Zegarra, R. Ramirez; Corno, E.; Melandri, E.; Abou‐Dakn, M.; Ghi, T.