- Correspondence to Professor Malcolm Kohler, Chair Respiratory Medicine, Clinical Director, Department of Pulmonology and Sleep Disorders Centre, University Hospital of Zurich, Raemistrasse 100, Zurich CH-8091, Switzerland;
- Received 25 July 2015
- Revised 10 November 2015
- Accepted 16 November 2015
- Published in print 1 February 2016.
- Published online 14 January 2016.
- Published first 15 December 2015.
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