Gramellini D, Fieni S, Kaihura, et al. C. Cervical lenght as a predictor of preterm delivery: gestational agerelated percentiles vs fixed cut-offs. Acta Biomed. 2007;78(3):220-224. Accessed April 24, 2026. https://mattioli1885journals.com/index.php/actabiomedica/article/view/1906