Evidence based medicine:
1. National Guideline Clearinghouse
2. National Institutes of Health
3. Scottish Intercollegiate Guidelines Network
4. Evidence Services

Endocrine disease:
1. Society for Endocrinology 
2. National Endocrine and Metabolic Diseases Information Service
3. International Diabetes Federation

Gastroenterology:
1. American Gastroenterological Association
2. British Society of Gastroenterology
3. British Association for the Study of the Liver

Respiratory disease:
1. British Thoracic Society
2. Global Initiative for Chronic Obstructive Lung Disease
3. American Thoracic Society

Haematological disease:
1. British Committee for Standards inHaematology
2. American Society of Hematology

Cardiovascular disease:
1. American College of Cardiology
2. European Resuscitation Council
3. The Resuscitation Council 
4. European Society of Cardiology
5. ECG library
6. HIGHLIGHTS of the 2015 American Heart Association Guidelines Update for CPR and ECC

Rheumatology:
1. American College of Rheumatology
2. British Society for Rheumatology
3. National Osteoporosis Society
4. European League Against Rheumatism

Renal disease:
1. Renal Association 
2. British Renal Society