Azimi, S., Zadeh Modarres, S., Heidar, Z., & Esfidani, T. "The effect of embryo transfer using abdominal and vaginal ultrasound methods on pregnancy outcome: a retrospective cohort study", The Iranian Journal of Obstetrics, Gynecology and Infertility, 26, 9, 2023, 20-28. doi: 10.22038/ijogi.2023.74631.5841