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Kvalheim, S., Sandven, I., Hagen, K., & Zwart, J. - A. (2013). Smoking as a risk factor for chronic musculoskeletal complaints is influenced by age. The HUNT study. Pain, 154(7), 1073–1079.
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Landmark, T., Romundstad, P., Dale, O., Borchgrevink, P. C., & Kaasa, S. (2012). Estimating the prevalence of chronic pain: validation of recall against longitudinal reporting (the HUNT pain study). Pain, 153(7), 1368–1373.
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