1. Rheumatoid arthritis;Scott;Lancet,2010
2. Davidson's Principles and Practice of Medicine;Nicholas,2001
3. Harrison's Principles of Internal Medicine;Peter,2001
4. Clinical Periodontology and Implant Dentistry;Lindhe,2008
5. Relationship between rheumatoid arthritis and periodontitis;Mercado;J Periodontol,2001