M. A. E.-M. Mohamed, N. M. Elfadaly, and S. R. Ibrahim, “POSSIBLE CORRELATION BETWEEN CHRONIC TRAMADOL ADMINISTRATION AND DISTURBANCES IN TESTICULAR ACTIVITY  AND FERTILITY IN MALE”, JMPS, vol. 2, no. 2, pp. 70–57, Jun. 2018, doi: 10.26389/AJSRP.M060318.