Liens étrangers

http://owl.orthogate.com/
 OrthoGate

http://www.aaos.org/
 American Association of Orthopaedic Surgeons

http://www.aast.org/
 American Association for the Surgery of Trauma

http://www.eans.org/
 European Association of Neurosurgical Societies

http://www.spondylitis.org/
 Spondylitis Association of America