- American Society for Gastrointestinal Endoscopy
- Associação Brasileira de Otorrinolaringologia e Cirurgia Cervico Facial
- BIREME
- British Society of Gastroenterology
- Canadian Association of Gastroenterology
- Canadian Journal of Gastroenterology
- Conselho Regional de Medicina do Ceará
- Cooperativa de Otorrinolaringologia do Estado do Ceara
- Crohn’s and Colitis Foundation of America
- Digestion Journal
- Disciplina de Otorrinolaringologia da USP
- Diseases of the Liver
- Fundação Otorrinolaringologia
- Gastroenterology
- Gastroesophageal Reflux Disease
- Gastrointestinal Endoscopy Atlas
- Helicobacter Pylori
- Helicobacter Pylori Infection Treament
- International Journal of Colorectal Disease
- Irritable and Functional Bowel Diseases
- Liver Diseases
- National Institute of Diabetes, Digestive, and Kidney Diseases
- New England Journal of Medicine
- Organisation Mondiale D’Endoscopie Digestive (OMED)
- Peptic Ulcer Disease
- Revista Brasileira de Otorrinolaringologia
- SOBED
- Sociedade Brasileira de Hepatologia
- Society for Surgery of the Alimentary Tract (SSAT)
- Society of American Gastrointestinal Endoscopic Surgeons (SAGES)
- Society of Laparoendoscopic Surgeons
- The American Society of Colon and Rectal Surgeons
- The Food and Drug Administration Homepage
- Therapeutic Endoscopy and Bleending Ulcers
- Thieme Interactive – Endoscopy
- World Health Organization