1. International Chiropractic Association, Recommended clinical protocols and guidelines for the practice of chiropractic,1992
2. Guidelines for chiropractic quality assurance and practice parameters;Haldeman,1992
3. Clinical guidelines for chiropractic practice in Canada,1994
4. Spinal manipulative therapy for low back pain;Assendelft;Cochrane Database Syst Rev,2004
5. The effectiveness of spinal manipulation for the treatment of headache disorders: a systematic review of randomized clinical trials;Astin;Cephalalgia,2002