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. 2021 Jun 7;148(2):368–380.e3. doi: 10.1016/j.jaci.2021.05.032

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© 2021 The Authors

Since January 2020 Elsevier has created a COVID-19 resource centre with free information in English and Mandarin on the novel coronavirus COVID-19. The COVID-19 resource centre is hosted on Elsevier Connect, the company's public news and information website. Elsevier hereby grants permission to make all its COVID-19-related research that is available on the COVID-19 resource centre - including this research content - immediately available in PubMed Central and other publicly funded repositories, such as the WHO COVID database with rights for unrestricted research re-use and analyses in any form or by any means with acknowledgement of the original source. These permissions are granted for free by Elsevier for as long as the COVID-19 resource centre remains active.

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Fig 5 — PDGF-AB/BB and CCL2 in BAL fluid and plasma. A, Concentrations of PDGF-AB/BB in plasma of healthy individuals and patients with severe COVID-19. B, Concentrations of PDGF-AB/BB in BAL fluid of healthy individuals and patients with severe COVID-19. C, Correlation between PDBF-AB/BB and CCL2 in BAL fluid of patients with severe COVID-19. D, Correlation between PDBF-AB/BB in plasma and CCL2 in BAL fluid of patients with severe COVID-19. E, Correlation between CCL2 and d-dimer levels in plasma of patients with severe COVID-19. F, Correlation between CCL2 and duration of hospitalization of patients with severe COVID-19. Nonparametric Spearman correlation coefficients were calculated to study the association between cytokines. ∗∗∗∗P < .0001, as determined by using the Mann-Whitney nonparametric test.