P01.07: Vaginal progesterone and cervical pessary for the prevention of SPB in patients with CCI ≤ 5th percentile at routine ultrasound 11–13.6 weeks. (September 2017) - Parra‐Saavedra, M.A.; Rivera‐Casas, A.; Sanchez‐Cubillos, S.; Diaz, I.; Gallo, D.M.; Barrero, A.; Parra, G.