- Correspondence to Dr Karsten Witt, Institut für Philosophie, Universität Duisburg-Essen, Universitätsstr. 12, Essen 45141, Germany;
- Received 11 May 2016
- Revised 10 January 2017
- Accepted 25 January 2017
- Published in print 17 March 2017.
- Published online 20 March 2017.
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