Both authors: Pulmonary, Allergy and Critical Care Division, Department of Medicine, Perelman School of Medicine, University of Pennsylvania, Philadelphia, PA.

*See also p. 1685.

Supported, in part, by the National Institutes of Health grant K23-HL140482.

Dr. Anderson received funding from the National Heart, Lung, Blood Institutes; he received support for article research from the National Institutes of Health. The remaining author has disclosed that they do not have any potential conflicts of interest.