American Chiropractic Association is a professional organization representing Doctors of Chiropractic. 

Arthritis Foundation is the only national not-for-profit organization that supports the more than 100 types of arthritis and related conditions with advocacy, programs, services and research. 

Bandolier is a journal about health care that uses evidence-based medicine techniques to provide advice about particular treatments or diseases for healthcare professionals and consumers. 

Centre for Reviews and Dissemination is a database of reviews concerning the effectiveness and cost-effectiveness of healthcare interventions.

Centre for Reviews and Dissemination is a database of reviews concerning the effectiveness and cost-effectiveness of healthcare interventions.

Cochrane Library is the world's most comprehensive database consisting exclusively of controlled clinical trials.

Colorado State Public Health Association is concerned with personal and environmental health, including pollution control, programs and policies related to chronic and infectious diseases, a smoke-free society, and professional education in public health.

Institute of Evidence-Based Chiropractic is an educational and research organization.

National Safety Council is a nonprofit, nongovernmental, international public service organization dedicated to protecting life and promoting health.

PubMed is a service of the U.S. National Library of Medicine that includes over 16 million citations from MEDLINE and other life science journals for biomedical articles back to the 1950s.