Watson, H A, Seed, P T, Carter, J, Hezelgrave, N L, Kuhrt, K, Tribe, R M & Shennan, A H 2019, ' Development and validation of the predictive models for the QUiPP App v.2 : a tool for predicting preterm birth in high-risk asymptomatic women ', Ultrasound in Obstetrics and Gynecology . https://doi.org/10.1002/uog.20401