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APA Citation
Hayes, D., Black, S. M., Tobias, J. D., Mansour, H. M., & Whitson, B. A. (2016). prevalence of Pulmonary Hypertension and its Influence on Survival in Patients With Advanced Chronic Obstructive Pulmonary Disease Prior to Lung Transplantation. COPD, 13, 50–56. http://access.bl.uk/ark:/81055/vdc_100057750827.0x000027