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APA Citation
Johnson, K. M., Khakban, A., Bryan, S., Sin, D. D., & Sadatsafavi, M. (2020). healthcare system encounters before COPD diagnosis: a registry-based longitudinal cohort study. Thorax, 75(2), 108–115. http://access.bl.uk/ark:/81055/vdc_100135558939.0x00002b