1. Department of Medicine, Hospital Regional de Huacho, Lima, Peru
2. Advanced Gastrointestinal Endoscopy, EmuraCenter LatinoAmerica, Bogotá, Colombia
3. Service of Gastroenterology, Department of Medical Specialties, National Institute of Neoplastic Diseases, Lima, Peru
4. Department of Pathology, Hospital Nacional Daniel Alcides Carrión, Lima, Peru
5. Hospital Guillermo Kaelin de la Fuente, Essalud, Lima, Peru