American Academy of Family Physicians
» http://www.aafp.org/online/en/home.html

American Academy of Physician Assistants
» http://www.aapa.org/

American Academy of Nurse Practitioners
» http://www.aanp.org/default.asp

Association of Family Practice Physician Assistants
» http://www.afppa.org/

American Diabetes Association
» http://www.diabetes.org/home.jsp

American Thyroid Association
» http://www.thyroid.org/

American Lung Association
» http://www.lungusa.org/site/

American College of Cardiology
» http://www.acc.org/

Centers for Disease Control and Prevention
» http://www.cdc.gov/

National Institutes of Health
» http://www.nih.gov/

United States National Library of Medicine
» http://www.nlm.nih.gov/

Clinical Trials
» http://clinicaltrials.gov/

Cochrane Primary Health Care Field
» http://www.cochraneprimarycare.org/ 

PubMed
» http://www.ncbi.nlm.nih.gov/entrez/query.fcgi

Cochrane Database
» http://www.cochrane.org/reviews/en/topics/index.html

Bandolier
» http://www.jr2.ox.ac.uk/bandolier/index.html