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Kang JI, Pt , Moon PJ, Pt , Jeong PK, Pt , Phd .  Effect of Squat Exercise Combined with Whole Body Vibration Exercise on Muscle Activity and Muscle Fatigue of Quadriceps in Patients with Patellofemoral Pain Syndrome.  J Korean Soc Phys Med 2021;16:41-48.  https://doi.org/10.13066/kspm.2021.16.1.41