- Correspondence to Martin G Friedrich, Department of Thoracic and Cardiovascular Surgery, University Medical Center Göttingen, 4037075 Goettingen, Robert-Koch-Str. 40, Germany;
- Received 20 December 2016
- Revised 9 August 2017
- Accepted 8 September 2017
- Published in print 1 October 2017.
- Published online 14 November 2017.
- Published first 23 September 2017.
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