American Gastroenterological Association

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