- Correspondence to Professor Lars Johan Materstvedt, Department of Philosophy and Religious Studies, Norwegian University of Science and Technology (NTNU), NO-7491 Trondheim, Norway;
- Received 9 September 2015
- Revised 26 February 2016
- Accepted 31 March 2016
- Published in print 1 September 2016.
- Published online 24 August 2016.
- Published first 25 April 2016.
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