The following license files are associated with this item:

Copyright © 2021 by the American Thoracic Society
This article is open access and distributed under the terms of the Creative Commons Attribution Non-Commercial No Derivatives License 4.0
(http://creativecommons.org/licenses/by-nc-nd/4.0/). For commercial usage and reprints, please contact Diane Gern (dgern@thoracic.org).
Except where otherwise noted, this item's license is described as Copyright © 2021 by the American Thoracic Society This article is open access and distributed under the terms of the Creative Commons Attribution Non-Commercial No Derivatives License 4.0 (http://creativecommons.org/licenses/by-nc-nd/4.0/). For commercial usage and reprints, please contact Diane Gern (dgern@thoracic.org).