Kerns RD, Otis J, Rosenberg R, et al. Veterans` reports of pain and associations with ratings of health, health-risk behaviors, affective distress, and use of the healthcare system. J Rehabil Res Dev 2003;40:371-9.
Koleva D, Krulichova I, Bertolinin G, et al. Pain in primary care: an Italian survey. Eur J Public Health 2005;15:475-9.
Portenoy RK, Ugarte C, Fuller I, et al. Population-based survey of pain in the United States: differences among White, African American, and Hispanic subjects. J Pain 2004;5:317-28.
Schmidt CO, Raspe H, Pfingsten M, et al. Backpain in the German adult population - prevalence, severity, and sociodemographic correlates in a multiregional survey. Spine 2007;32:2005-11.
Breivik H, Collett B, Ventafridda V, et al. Survey of chronic pain in Europe: prevalence, impact on daily life, and treatment. Eur J Pain 2006;10:287-333.
Gureje O, Von Korff M, Simon GE, et al. Persistent pain and well-being: a World Health Organization study in primary care. JAMA 1998;280:147-51.
Gerdle B, Björk J, Henriksson C, et al. Prevalence of current and chronic pain and their influences upon work and healthcare-seeking: a population study. J Rheumatol 2004;31:1399-406.
Watkins EA, Wollan PC, Melton J, et al. A population in pain: report from the Olmsted Country Health Study. Pain Med 2008;9:166-74.
Cassidy JD, Côté P, Carroll LJ, et al. Incidence and course of low back pain episodes in the general population. Spine 2005;30:2817-23.
Parsons S, Breen A, Foster NE, et al. Prevalence and comparative troublesomeness by age of musculoskeletal pain in different body locations. Fam Pract 2007;24:308-16.
Hamunen K, Laitinen-Parkkonon P, Paakkari P, et al. What do different databases tell about the use of opioids in seven European countries in 2002? Eur J Pain 2008;12:705-15.
Wallstein S. Regulation and internet use in developing countries. Econ Dev Cultural Change 2005;53:501-23.
Baldwin KA, Grinslade MS, Baer LC, et al. Higher-order factor analysis of an instrument with dichotomous data. Res Nursing Health 2005;28:431-40.
Tabachnick BG, Fidell LS. Using multivariate statistics. 4th edn. New York: Harper-Collins, 2001.
Cook AJ, Roberts DA, Henderson MD, et al. Electronic pain questionnaires: a randomized, crossover comparison with paper questionnaires for chronic pain assessment. Pain 2004;110:310-17.
Lungenhausen M, Lange S, Maier C, et al. Randomised controlled comparison of the Health Survey Short Form (SF-12) and the Graded Chronic Pain Scale (GCPS) in telephone interviews versus self-administered questionnaires. Are the results equivalent? BMC Med Res Methodol 2007;7:50.
Nowakowska-Zajdel E, Kokot T, Pogwizd M, et al. Taking nonsteroidal anti-inflammatory drugs by teenagers from Zawiercie. Ann Acad Med Siles 2007;61:372-5.
Broekmans S, Dobbels F, Milisen K, et al. Medication adherence in patients with chronic non-malignant pain: is there a problem? Eur J Pain 2009;13:115-23.
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