MATERIALS AND METHODS
This is a retrospective cohort pilot study of patients who underwent
universal transvaginal ultrasound (TVUS) CL screening during routine
second-trimester anatomy scan and subsequently delivered at a single
academic institution in 2018. This study was approved by the
institutional review board of New York University Langone Health
(NYULH), as was a waiver of consent, given the retrospective
observational nature of this research.