Chou, Roger, et al. "Diagnosis and treatment of low back pain: a joint clinical practice guideline from the American College of Physicians and the American Pain Society." Annals of internal medicine 147:7 (2007): 478-491.
Freburger, Janet K., et al. "The rising prevalence of chronic low back pain." Archives of Internal Medicine 169:3 (2009): 251.
Fritz JM., Childs JD., Wainner RS., Flynn TW. “Primary Care Referral of Patient With Low Back Pain to Physical Therapy: Impact on Future Health Care Utilization and Costs”. Spine. 37:25 (2012) 2114-2121.