Cell-free stem cell-derived extract formulation for treatment of knee osteoarthritis: study protocol for a preliminary non-randomized, open-label, multi-center feasibility and safe... von Gupta, Ashim, Maffulli, Nicola, Rodriguez, Hugo C, Mistovich, R Justin, Delfino, Kristin, Cady, Craig, Fauser, Anne-Marie, Cundiff, Echo D, Martinez, Marte A, Potty, Anish G

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