Metabolomics of exhaled breath in critically ill COVID-19 patients: A pilot study oleh Stanislas Grassin-Delyle, Ph.D., Camille Roquencourt, M.S., Pierre Moine, M.D., Gabriel Saffroy, Stanislas Carn, Nicholas Heming, M.D., Jérôme Fleuriet, Ph.D., Hélène Salvator, M.D., Emmanuel Naline, Ph.D., Louis-Jean Couderc, M.D., Philippe Devillier, M.D., Etienne A. Thévenot, Ph.D., Djillali Annane, M.D.