1. Department of Internal Medicine, Pontificia Universidad Javeriana, Bogotá, Colombia
2. Unit of Gastroenterology, Hospital Universitario San Ignacio, Bogotá, Colombia
3. Department of Internal Medicine, Pontificia Universidad Javeriana, Cra. 7 #40-62, Bogotá 1111, Colombia
4. Department of Internal Medicine, Hospital Universitario San Ignacio, Bogotá, Colombia