Duymus, T. M., Mutlu, S., Dernek, B., Komur, B., Aydogmus, S., Kesiktas, F. N. Choice of intra-articular injection in treatment of knee osteoarthritis: platelet-rich plasma, hyaluronic acid or ozone options. Knee Surgery, Sports Traumatology, Arthroscopy 2017; 2: 485-492