Talebi, Seyed, Ahmad Roudsari, Seyed Zolhavarieh, Lobat Majidi, Hossein Ghiasi, Jalal Poorolajal, and Seyed Vafaei. “Comparison of the Pain-Killing Effects of Leech Therapy Versus Physiotherapy in Patients With Knee Osteoarthritis: A Double-Blind Randomized Clinical Trial”. Biomedical Research and Therapy 9, no. 6 (June 30, 2022): 5095-5101. Accessed October 4, 2022. http://home.biomedpress.org/index.php/BMRAT/article/view/744.