1. Methodological considerations in the assessment of direct and indirect costs of back pain: A systematic scoping review;Zemedikun;PLoS One,2021
2. Non-specific low back pain;Balagué;Lancet,2012
3. Grading the severity of chronic pain;Von Korff;Pain,1992
4. Quality of Life in Chronic Low Back Pain: A Comparison with Fibromyalgia and the General Population;Hagg;J. Musculoskelet. Pain,2003
5. Employers,NHS. [Online] NHS. [Cited: 2019 October 29th.] http://www.nhsemployers.org/-/media/Employers/Documents/Retain-and-improve/Back-in-Work/Back-in-work-part-1-Introduction-and-key-messages-web-final-25-March.pdf?la=en&hash=EFA3598B5B049291C6F3B0CF9B8AFE34529C5C60m.