Gockel, Maarit, Harri Lindholm, Leena Niemistö, and Heikki Hurri. “Perceived Disability But Not Pain Is Connected With Autonomic Nervous Function Among Patients With Chronic Low Back Pain”. Journal of Rehabilitation Medicine 40, no. 5 (May 11, 2008): 355–358. Accessed February 21, 2025. https://medicaljournalssweden.se/jrm/article/view/18151.