Jaber, M. O., and F. A. Sharif. “Association Between Functional Polymorphisms of Foxp3 and Interleukin-21 Genes With the Occurrence of Recurrent Pregnancy Loss in Gaza Strip-Palestine”. International Journal of Research in Medical Sciences, vol. 2, no. 4, Jan. 2017, pp. 1687-93, https://www.msjonline.org/index.php/ijrms/article/view/2486.