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Koopman, M., Vanfleteren, L. E., Steijns, S., Wouters, E. F., & Sprooten, R. (2017). increased exercise tolerance using daytime mouthpiece ventilation for patients with diaphragm paralysis. Breathe, 13(3), 225–229. http://access.bl.uk/ark:/81055/vdc_100172056044.0x000015