References
  1.  Gatti R. Efficacy of Trunk Balance Exercises for Individuals With Chronic Low Back Pain. J Orthop Sports Phys Ther. 2011. Available at: http://www.jospt.org/issues/id.2593/article_detail.asp. Accessed August 19, 2011.
  2.  Macedo LG, Maher CG, Latimer J, McAuley JH. Motor control exercise for persistent, nonspecific low back pain: a systematic review. Physical Therapy. 2009;89(1):9-25. Available at: http://www.ncbi.nlm.nih.gov/pubmed/19056854.