Cervical expression of elafin and secretory leukocyte peptidase inhibitor does not predict preterm delivery in twin pregnancy – results from a pilot study (A. Saletra-Bielińska, K. Kosińska-Kaczyńska, I. Szymusik, J. Niderla-Bielińska, J. Malejczyk, & M. Wielgoś , Trans.). (2021). Journal of Medical Science, 90(1), e490. https://doi.org/10.20883/medical.e490