Acknowledgements
The authors thank Alison Schroeer (Schroeer Scientific Illustration) for advice and assistance concerning the figure production and Dr Roger D. Seheult, (MedCram) for invaluable insights relating to pulmonary medicine and COVID-19. SA wrote the paper, LFB produced the figures 1,2 and the supplementary figure and made the first draft of the paper. DB made the second draft. All authors read and approved the final draft.