- Correspondence to Elin Ekblom-Bak, Åstrand Laboratory of Work Physiology, The Swedish School of Sport and Health Sciences, Box 5626, Stockholm 114 86, Sweden;
- Accepted 12 September 2013
- Published in print 1 February 2014.
- Published online 10 January 2014.
- Published first 28 October 2013.
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