- Correspondence to Dr Malcolm Kohler, Department of Pulmonology, University Hospital Zurich, Zurich 8091, Switzerland;
- Received April 19, 2018
- Revised June 21, 2018
- Accepted July 23, 2018
- First published August 12, 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.