Setting: Ecuadorian Institute of Digestive Diseases (IECED), OmniHospital Academic Tertiary Center. We will include patients from October 2015 to December 2015. Patients will be recruited from the gastroenterology unit (IECED). The study protocol and consent form has been approved by the Institutional Review Board (IRB) and will be conducted according to the declaration of Helsinki. Patients will sign an informed consent.