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The relationship between endometrium thickness on the hCG trigger day and adjusted preterm delivery incidence. Analyses were adjusted for maternal age, paternal age, maternal BMI, basal FSH, anti-Müllerian hormone (AMH), type of infertility, prior gonadotropin cycle, ovarian stimulation protocols, dosage of gonadotropins, estrogen (E2) level on the hCG trigger day, number of oocytes retrieved, fertilization method, number and stage of embryos transferred, and gender of newborn.
