- Correspondence to Dr. Frank Tacke, Department of Medicine III, University Hospital Aachen, Pauwelsstrasse 30, 52074 Aachen, Germany;
- Received 12 April 2017
- Revised 24 March 2017
- Accepted 13 April 2017
- Published in print 6 May 2017.
- Published online 8 May 2017.
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