ROUDBARI, Aliakbar. Production of Hydroxyl Free Radical, the Main Mechanism for Removing Steroid Hormones by Ultrasound. International Journal of Health Studies, [S.l.], nov. 2016. ISSN 2423-6594. Available at: <http://ijhs.shmu.ac.ir/index.php/ijhs/article/view/155>. Date accessed: 10 aug. 2020. doi: http://dx.doi.org/10.22100/ijhs.v2i3.155.