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APA Citation
Du, P., Li, D., Wang, A., Shen, S., Ma, Z., & Li, X. (2021). a Systematic Review and Meta-Analysis of Risk Factors Associated with Severity and Death in COVID-19 Patients. Canadian journal of infectious diseases & medical microbiology =, 2021, . http://access.bl.uk/ark:/81055/vdc_100127517305.0x000022