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Kang JI, Pt , Keunjeong P, Pt , Park PS, Pt , Phd .  Effects of Frequency-Dependent Neuromuscular Electrical Stimulation on The Respiratory Strength, Quadriceps Muscle Activity and Quality of Life in Patients with Severe Chronic Obstructive Pulmonary Disease.  J Korean Soc Phys Med 2019;14:81-89.  https://doi.org/10.13066/kspm.2019.14.3.81