“18 Month Observational Study on Efficacy of Intraarticular Hyaluronic Acid (Hylan G-F 20) Injections under Ultrasound Guidance in Hip Osteoarthritis”. Reumatismo 58, no. 1 (March 30, 2006): 39–49. Accessed April 29, 2025. https://www.reumatismo.org/reuma/article/view/reumatismo.2006.39.