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. 2017 Dec 13;109(4):584–594. doi: 10.1093/bja/aes230

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© 2012 The Author(s)

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 2 — Upper panels: average inspiratory P_el/V curves recorded from zero PEEP in the three groups. Middle panels: average inspiratory P_el/V curves recorded from PEEP 15 cm H₂O. Lower panels: average expiratory P_el/V curves recorded from 50 cm H₂O. Volume trends over time in the direction of the arrows were significant over the indicated pressure ranges.