Effects of preconceptional vitamin D levels on in vitro fertilization outcomes in infertile patients with polycystic ovary syndrome: A retrospective cohort study von Tunçcan, Emre, Mohri, Parsa, Dikeç, Mirkan, Karaawi, Fatimah, Kazaz, Elif, Kocatepe, Cavit, Dokuzlu, Gizem, Tıraş, Bülent, Çakıroğlu, Ahmet Yiğit, Korun, Zeynep Ece Utkan

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