Keshavarz E, Tavakkol E, Momeni Moghaddam A, Jalali M, Molaeipoor L, Kabir A. Investigating the relationship between fetus heart rate in the first trimester screening with fetus sex. J. Contemp. Med. Sci. [Internet]. 2018 Mar. 26 [cited 2026 May 19];4(1). Available from: https://www.jocms.org/index.php/jcms/article/view/326