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APA Citation
Lun, C., Chan, V. L., Leung, W., Cheung, A. P., Cheng, S., Tsui, M. S., & Chu, C. (2013). a pilot randomized study comparing two methods of non‐invasive ventilation withdrawal after acute respiratory failure in chronic obstructive pulmonary disease. Respirology, 18(5), 814–819. http://access.bl.uk/ark:/81055/vdc_100024481483.0x00004a