The sources of articles, materials and tables
- University of Nebraska at Omaha
- Pearson Education: Anatomy and Physiology
- Mayo Clinic
- MedicineNet
- National Kidney Foundation
- The American Accreditation HealthCare Commission
- Healthwise
- British National Formulary
- Encyclopædia Britannica
- American Cancer Society
- National Cancer Institute
- Center Watch
- Medical Encyclopedia
- The American Academy of Ophthalmology
- Wall Street Journal
- American Psychiatric Association
- Nelson Textbook of Pediatrics
- Medical Epidemiology
- Canadian Institutes of Health Research
- Canadian Medical Association
- Collège des médecins du Québec
- Oxford University