E. Endrinaldi, E. Darwin, N. Zubir, and G. Revilla, “The Effect of Mesenchymal Stem Cell Wharton’s Jelly on Matrix Metalloproteinase-1 and Interleukin-4 Levels in Osteoarthritis Rat Model”, Open Access Maced J Med Sci, vol. 7, no. 4, pp. 529–535, Feb. 2019.