Dorosti, R., Ghasemi, M., Khademi Kalantari, K., & Akbarzade Baghban, A. (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), 169–176. https://doi.org/10.22037/jcpr.v2i4.18868