1. Nachemson A, Waddell G, Norlund AI. Epidemiology of neck and low back pain. In: Nachemson A, Jonsson E editors, Neck and back pain: The scientific evidence of causes, diagnosis, and treatment. Philadelphia: Lippincott Williams & Wilkins, 2000, p. 165–87.
2. Waddell G, Aylward M, Sawney P. Back pain, incapacitiy for work and social security benefits: An international literature review and analysis. London: The Royal Society of Medicine Press 2002.
3. Crombie IK, Davies JTP. Requirements for epidemiological studies. In: Crombie IK, Croft PF, Linton SJ, LeResche L, Von Korff M editors, Epidemiology of pain. Seattle: IASP Press; 1999, p. 17–24.
4. Guo HR, Tanaka S, Cameron LL. Back pain among workers in the United States: National estimates and workers at high risk. Am J Ind Med 1995; 28:591–602.
5. Feldman JB. The prevention of occupational low back pain disability: evidence-based reviews point in a new direction. J Surg Orthop Adv 2004;13:1–14.