1. Section for Health and Exercise Physiology Department of Public Health and Sport Sciences Inland Norway University of Applied Sciences Elverum Norway
2. Swedish School of Sport and Health Sciences Box 5626 SE‐114 86 Stockholm Sweden
3. Innlandet Hospital Trust Postboks 990 2629 Lillehammer Norway
4. Hospital for Rheumatic Diseases Magrethe Grundtvigsvei 6 2609 Lillehammer Norway
5. Brigham and Women's Hospital 75 Francis Street Boston MA 02115 USA