Svebak, Sven, and Hallgeir Halvari. 2018. “Sickness Absence Due to Chronic Musculoskeletal Pain: The Exploration of a Predictive Psychological Model Including Negative Moods, Subjective Health and Work Efficacy in an Adult County Population (The HUNT Study)”. Europe’s Journal of Psychology 14 (2), 373-85. https://doi.org/10.5964/ejop.v14i2.1470.