Bibliografia

• Pressman SD, Matthews KA, Cohen S et al. Association of Enjoyable Leisure Activities With Psychological and Physical Well-Being. Psychosom Med September 2009; 71: 725-32.

• Schimmel JJP, de Kleuver M, Horsting PP et al. No effect of traction in patients with low back pain: a single centre, single blind, randomized controlled trial of Intervertebral Differential Dynamics Therapy® 2009; 18 (12): 1843-50.

• Staal JB, de Bie RA, de Vet HC et al. Injection Therapy for Subacute and Chronic Low Back Pain: An Updated Cochrane Review. Spine 2009; 34 (1): 49-59.