- Correspondence to Dr Robert Vassallo, Departments of Medicine, Division of Pulmonary and Critical Care Medicine, Physiology and Biomedical Engineering, Mayo Clinic, Rochester, Minnesota 55905, USA;
- Received 10 February 2017
- Revised 10 May 2017
- Accepted 15 May 2017
- Published online 8 July 2017.
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.