Recovery after critical illness in patients aged 80 years or older: a multi-center prospective observational cohort study

Daren K. Heyland, Allan Garland, Sean M. Bagshaw, Deborah Cook, Kenneth Rockwood, Henry T. Stelfox, Peter Dodek, Robert A. Fowler, Alexis F. Turgeon, Karen Burns, John Muscedere, Jim Kutsogiannis, Martin Albert, Sangeeta Mehta, Xuran Jiang, Andrew G. Day