1 Division of Pulmonary, Allergy and Critical Care Medicine, Department of Medicine, University of Pittsburgh, Pittsburgh, PA; Asthma and Environmental Lung Health Institute@UPMC, University of Pittsburgh, Pittsburgh, PA.
2 Division of Pulmonary, Allergy and Critical Care Medicine, Department of Medicine, University of Pittsburgh, Pittsburgh, PA.
3 Division of Pulmonary, Allergy and Critical Care Medicine, Department of Medicine, University of Pittsburgh, Pittsburgh, PA; Asthma and Environmental Lung Health Institute@UPMC, University of Pittsburgh, Pittsburgh, PA; Department of Environmental and Occupational Health, University of Pittsburgh, Pittsburgh, PA. Electronic address: swenzel@pitt.edu.