A multivariable model to guide the decision for pessary placement to prevent preterm birth in women with a multiple pregnancy: a secondary analysis of the ProTWIN trial

P. Tajik, M. Monfrance, J. van 't Hooft, S. M.S. Liem, E. Schuit, K. W.M. Bloemenkamp, J. J. Duvekot, B. Nij Bijvank, M. T.M. Franssen, M. A. Oudijk, H. C.J. Scheepers, J. M. Sikkema, M. Woiski, B. W.J. Mol, D. J. Bekedam, P. M. Bossuyt, M. H. Zafarmand^*

^*Corresponding author for this work