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Gupta, A., Maffulli, N., Rodriguez, H.C. et al. Safety and efficacy of umbilical cord-derived Wharton’s jelly compared to hyaluronic acid and saline for knee osteoarthritis: study protocol for a randomized, controlled, single-blind, multi-center trial. J Orthop Surg Res 16, 352 (2021). https://doi.org/10.1186/s13018-021-02475-6
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Gupta, Ashim; Maffulli, Nicola; Rodriguez, Hugo C; Carson, Eric W; Bascharon, Randa A; Delfino, Kristin; Levy, Howard J; and El-Amin, Saadiq F, "Safety and efficacy of umbilical cord-derived Wharton's jelly compared to hyaluronic acid and saline for knee osteoarthritis: Study protocol for a randomized, controlled, single-blind, multi-center trial." Journal of Orthopaedic Surgergy and Research. 16, 1. 352 (2021).