Mohamad Yosof Rezk, R. R. A. K. A. “Gender Differences of Preptin Levels in Rat Models of Hypogonadism”. International Journal of Medical Sciences and Academic Research, vol. 2, no. 04, Aug. 2021, pp. 4-9, https://scientificpublications.in/index.php/ijmsar/article/view/23.