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APA Citation
Black-Shinn, J. L., Kinney, G. L., Wise, A. L., Regan, E. A., Make, B., Krantz, M. J., Barr, R. G., Murphy, J. R., Lynch, D., Silverman, E. K., Crapo, J. D., Hokanson, J. E., & Investigators, t. C. (n.d.). cardiovascular Disease is Associated with COPD Severity and Reduced Functional Status and Quality of Life. COPD, 11, 546–551. http://access.bl.uk/ark:/81055/vdc_100024934602.0x000036