- Correspondence to Dr Carolyn M Hendrickson, Division of Pulmonary and Critical Care Medicine, Department of Medicine, University of California San Francisco, San Francisco, CA 94110, USA;
- Received February 7, 2018
- Accepted May 10, 2018
- First published June 27, 2018.
If you wish to reuse any or all of this article please use the link below which will take you to the Copyright Clearance Center’s RightsLink service. You will be able to get a quick price and instant permission to reuse the content in many different ways.