Intra-articular Infiltration of Platelet-Rich Plasma versus Hyaluronic Acid in Patients with Primary Knee Osteoarthritis: Preliminary Results from a Randomized Clinical Trial - Arliani, G G; Durigon, T S; Pedroso, J P; Ferreira, G F; Oksman, D; Oliveira, V O (Rev Bras Ortop, 2021)