- Correspondence to Elin Anita Fadum, The Norwegian Armed Forces Medical Services, Institute of Military Epidemiology, 0028A, Sessvollmoen N-2058, Norway;
- Received 15 April 2016
- Accepted 28 June 2016
- Published in print 1 January 2017.
- Published online 9 December 2016.
- Published first 14 July 2016.
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