Sassoli, Chiara, et al. “Mesenchymal Stromal Cells and Their Paracrine Factors Regulate MMP-2 and MMP-9 TIMP-2 Balance in Skeletal Myoblasts and Fibroblasts: New Insights into the Potential Role of MSC-Cell Therapy in Muscle Regenerative Medicine”. Italian Journal of Anatomy and Embryology, vol. 118, no. 2, Jan. 2014, p. 166, https://oajournals.fupress.net/index.php/ijae/article/view/3855.