1. Low-back pain definitions in occupational studies were categorized for a meta-analysis using Delphi consensus methods. J Clin Epidemiol 60: 625;LE Griffith,2007
2. The epidemiology of low back pain;D Hoy;Best Pract Res Clin Rheumatol,2010
3. Bevan S, Quadrello T, McGee R, Mahdon M, Vavrovsky A, et al.. (2009) Fit for work? Musculoskeletal disorders in the European workforce. London: The Work Foundation, 2009.
4. Epidemiology of back disorders: prevalence, risk factors, and prognosis;NJ Manek;Curr Opin Rheumatol,2005
5. Prevalence of sleep disturbance in patients with low back pain;SM Alsaadi;European Spine Journal,2011