- Correspondence to Dr Pratik Sinha, Division of Pulmonary and Critical Care Medicine, Department of Medicine, University of California, San Francisco, CA 94143, USA;
- Accepted March 5, 2018
- First published March 22, 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.