1 Division of Pulmonary and Critical Care Medicine, Johns Hopkins University School of Medicine, Baltimore, MD, Outcomes After Critical Illness and Surgery (OACIS) Group, Baltimore, MD, and Department of Epidemiology, Johns Hopkins University School of Medicine, Baltimore, MD Division of Pulmonary and Critical Care Medicine, Johns Hopkins University School of Medicine, Baltimore, MD, Outcomes After Critical Illness and Surgery (OACIS) Group, Baltimore, MD, and National Institutes of Health, Critical Care Medicine Department, Bethesda, MD Division of Pulmonary and Critical Care Medicine, Johns Hopkins University School of Medicine, Baltimore, MD, Outcomes After Critical Illness and Surgery (OACIS) Group, Baltimore, MD, and Department of Physical Medicine and Rehabilitation, Johns Hopkins University School of Medicine, Baltimore, MD.