Dorosti, R. et al. 2017. Comparison of Electrical Activity of Core Stability Muscles of Trunk and Knee Muscles in People With and Without Patellofemoral Pain Syndrome during Stair-Stepping. Journal of Clinical Physiotherapy Research. 2, 4 (Oct. 2017), 169–176. DOI:https://doi.org/10.22037/jcpr.v2i4.18868.