S. Svebak and H. Halvari, “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)”, Eur J Psychol, vol. 14, no. 2, p. Article e1470, Jun. 2018.