American College of Rheumatology
http://www.rheumatology.org/index.asp/

Archives of Rheumatology
http://archrheumatol.net/

Arthritis Foundation
http://www.arthritis.org/

Association of Rheumatology Health Professionals
http://www.rheumatology.org/arhp/

Liga Reumatológica Española
http://www.lire.es/

National Institute of Arthritis and Musculoskeletal and skin Diseases
http://www.nih.gov/niams/

National Osteoporosis Foundation
http://www.nof.org/

Reumatología en Entorno Médico.org
http://reumatología.entornomedio.org/

Sociedad Española de Reumatología
http://www.ser.es

The American Association of Clinical Endocrinologist. Osteoporosis
http://www.aace.com/clin/guides/osteoporosis.html/

The Osteoporosis File. Center for Current Research
http://www.lifestages.com/health/osteopor.html/