- Correspondence to Dr Michael Kreuter, Center for Interstitial and Rare Lung Diseases, Pneumology and Respiratory Critical Care Medicine, Thoraxklinik, Heidelberg University Hospital, Röntgenstrasse 1, Heidelberg 69120, Germany;
- Received 22 April 2016
- Revised 27 July 2016
- Accepted 8 August 2016
- Published online 13 January 2017.
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