Comparison of intra-articular injections of plasma rich in growth factors (PRGF-Endoret) versus durolane hyaluronic acid in the treatment of patients with symptomatic osteoarthritis: A randomized controlled trial - Vaquerizo, V.; Plasencia, M.Á.; Arribas, I.; Seijas, R.; Padilla, S.; Orive, G.; Anitua, E. (Arthroscopy - Journal of Arthroscopic and Related Surgery, 2013)