Stecco, A., C. Pirri, R. De Caro, and P. Raghavan. “Stiffness and Echogenicity: Development of a Stiffness-Echogenicity Matrix for Clinical Problem Solving”. European Journal of Translational Myology, vol. 29, no. 3, Sept. 2019, doi:10.4081/ejtm.2019.8476.