1 Department of Medicine, Division of Pulmonary, Allergy, Critical Care and Sleep Medicine, University of Pittsburgh, Pittsburgh, PA; Acute Lung Injury and Infection Center of Excellence, University of Pittsburgh, Pittsburgh, PA; Center for Medicine and the Microbiome, University of Pittsburgh, Pittsburgh, PA. Electronic address: kitsiosg@upmc.edu.
2 Department of Medicine, Division of Pulmonary, Allergy, Critical Care and Sleep Medicine, University of Pittsburgh, Pittsburgh, PA; Acute Lung Injury and Infection Center of Excellence, University of Pittsburgh, Pittsburgh, PA; Center for Medicine and the Microbiome, University of Pittsburgh, Pittsburgh, PA.