1. BOGDUK N, MCGUIRK B: Medical management of acute and chronic low back pain. An evidence-based approach. Elsevier, Amsterdam, The Netherlands (2002).
2. NATIONAL ADVISORY COMMITTEE ON CORE HEALTH AND DISABILITY SERVICES, ACCIDENT REHABILITATION AND COMPENSATION INSURANCE CORPORATION: Clinical Practice Guidelines. Acute Low Back Problems M Adults: Assessment and Treatment. Core Services Committee, Ministry of Health Wellington, New Zealand (1995).
3. AUSTRALIAN ACUTE MUSCULOSKELETAL PAIN GUIDELINES GROUP: Evidence-Based Management of Acute Musculoskeletal Pain. Australian Academic Press, Brisbane, Australia (2003).
4. Ketorolac versus acetaminophen-codeine in the emergency department treatment of acute low back pain