- Correspondence to Dr Kimmo Herttua, Public Health, CMSS, University of Southern Denmark, Esbjerg 6700, Denmark;
- Received 26 June 2017
- Revised 19 September 2017
- Accepted 20 September 2017
- Published in print 1 December 2017.
- Published online 7 November 2017.
- Published first 23 October 2017.
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