Rölfing, J. D. ., R. D. . Jensen, and C. Paltved. “HipSim — Hip Fracture Surgery Simulation Utilizing the Learning Curve–Cumulative Summation Test (LC-CUSUM)”. Acta Orthopaedica, vol. 91, no. 6, June 2020, pp. 669–674, doi:10.1080/17453674.2020.1777511.