Comment on

• Causal assessment of occupational bending or twisting and low back pain: results of a systematic review.

  Wai EK, Roffey DM, Bishop P, Kwon BK, Dagenais S. Wai EK, et al. Spine J. 2010 Jan;10(1):76-88. doi: 10.1016/j.spinee.2009.06.005. Epub 2009 Jul 23. Spine J. 2010. PMID: 19631589
• Causal assessment of awkward occupational postures and low back pain: results of a systematic review.

  Roffey DM, Wai EK, Bishop P, Kwon BK, Dagenais S. Roffey DM, et al. Spine J. 2010 Jan;10(1):89-99. doi: 10.1016/j.spinee.2009.09.003. Epub 2009 Nov 11. Spine J. 2010. PMID: 19910263
• Causal assessment of occupational sitting and low back pain: results of a systematic review.

  Roffey DM, Wai EK, Bishop P, Kwon BK, Dagenais S. Roffey DM, et al. Spine J. 2010 Mar;10(3):252-61. doi: 10.1016/j.spinee.2009.12.005. Epub 2010 Jan 25. Spine J. 2010. PMID: 20097618
• Causal assessment of occupational standing or walking and low back pain: results of a systematic review.

  Roffey DM, Wai EK, Bishop P, Kwon BK, Dagenais S. Roffey DM, et al. Spine J. 2010 Mar;10(3):262-72. doi: 10.1016/j.spinee.2009.12.023. Spine J. 2010. PMID: 20207335
• Causal assessment of occupational carrying and low back pain: results of a systematic review.

  Wai EK, Roffey DM, Bishop P, Kwon BK, Dagenais S. Wai EK, et al. Spine J. 2010 Jul;10(7):628-38. doi: 10.1016/j.spinee.2010.03.027. Epub 2010 May 5. Spine J. 2010. PMID: 20447872
• Causal assessment of occupational pushing or pulling and low back pain: results of a systematic review.

  Roffey DM, Wai EK, Bishop P, Kwon BK, Dagenais S. Roffey DM, et al. Spine J. 2010 Jun;10(6):544-53. doi: 10.1016/j.spinee.2010.03.025. Spine J. 2010. PMID: 20494815
• Causal assessment of occupational lifting and low back pain: results of a systematic review.

  Wai EK, Roffey DM, Bishop P, Kwon BK, Dagenais S. Wai EK, et al. Spine J. 2010 Jun;10(6):554-66. doi: 10.1016/j.spinee.2010.03.033. Spine J. 2010. PMID: 20494816
• Causal assessment of workplace manual handling or assisting patients and low back pain: results of a systematic review.

  Roffey DM, Wai EK, Bishop P, Kwon BK, Dagenais S. Roffey DM, et al. Spine J. 2010 Jul;10(7):639-51. doi: 10.1016/j.spinee.2010.04.028. Epub 2010 May 26. Spine J. 2010. PMID: 20537959