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Kopperstad, Øyvind, Jens Christoffer Skogen, Børge Sivertsen, Grethe S. Tell, and Solbjørg Makalani Myrtveit Sæther. "Physical Activity Is Independently Associated With Reduced Mortality: 15-years Follow-up of the Hordaland Health Study (HUSK)." PLoS One 2017.

Kopperstad, Øyvind, et al. "Physical Activity Is Independently Associated With Reduced Mortality: 15-years Follow-up of the Hordaland Health Study (HUSK)." PLoS One 2017.